Drop struct BootStat and all usage (boot stats are now sent from chromeos code).

chrome/browser/chromeos/boot_times_loader.cc

Index: chrome/browser/chromeos/boot_times_loader.cc
diff --git a/chrome/browser/chromeos/boot_times_loader.cc b/chrome/browser/chromeos/boot_times_loader.cc
index 594ff4284188c84e24ea751f5863304eaba5c1e8..2ef50a18b3e72aed2c318bf165eabe0325e6c9fa 100644
--- a/chrome/browser/chromeos/boot_times_loader.cc
+++ b/chrome/browser/chromeos/boot_times_loader.cc
@@ -69,16 +69,6 @@ const std::string GetTabUrl(RenderWidgetHost* rwh) {
   return std::string();
 }
 
-void PostCallbackIfNotCanceled(
-    const CancelableTaskTracker::IsCanceledCallback& is_canceled_cb,
-    base::TaskRunner* task_runner,
-    const chromeos::BootTimesLoader::GetBootTimesCallback& callback,
-    const chromeos::BootTimesLoader::BootTimes& boot_times) {
-  if (is_canceled_cb.Run())
-    return;
-  task_runner->PostTask(FROM_HERE, base::Bind(callback, boot_times));
-}
-
 }  // namespace
 
 namespace chromeos {
@@ -135,152 +125,6 @@ BootTimesLoader* BootTimesLoader::Get() {
   return g_boot_times_loader.Pointer();
 }
 
-CancelableTaskTracker::TaskId BootTimesLoader::GetBootTimes(
-      const GetBootTimesCallback& callback,
-      CancelableTaskTracker* tracker) {
-  if (!BrowserThread::IsMessageLoopValid(BrowserThread::FILE)) {
-    // This should only happen if Chrome is shutting down, so we don't do
-    // anything.
-    return CancelableTaskTracker::kBadTaskId;
-  }
-
-  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
-  if (command_line.HasSwitch(switches::kTestType)) {
-    // TODO(davemoore) This avoids boottimes for tests. This needs to be
-    // replaced with a mock of BootTimesLoader.
-    return CancelableTaskTracker::kBadTaskId;
-  }
-
-  CancelableTaskTracker::IsCanceledCallback is_canceled;
-  CancelableTaskTracker::TaskId id = tracker->NewTrackedTaskId(&is_canceled);
-
-  GetBootTimesCallback callback_runner =
-      base::Bind(&PostCallbackIfNotCanceled,
-                 is_canceled, base::MessageLoopProxy::current(), callback);
-  BrowserThread::PostTask(
-      BrowserThread::FILE,
-      FROM_HERE,
-      base::Bind(&Backend::GetBootTimesAndRunCallback,
-                 backend_, is_canceled, callback_runner));
-  return id;
-}
-
-// Extracts the uptime value from files located in /tmp, returning the
-// value as a double in value.
-static bool GetTime(const base::FilePath::StringType& log, double* value) {
-  base::FilePath log_dir(kLogPath);
-  base::FilePath log_file = log_dir.Append(log);
-  std::string contents;
-  *value = 0.0;
-  if (file_util::ReadFileToString(log_file, &contents)) {
-    size_t space_index = contents.find(' ');
-    size_t chars_left =
-        space_index != std::string::npos ? space_index : std::string::npos;
-    std::string value_string = contents.substr(0, chars_left);
-    return base::StringToDouble(value_string, value);
-  }
-  return false;
-}
-
-// Converts double seconds to a TimeDelta object.
-static base::TimeDelta SecondsToTimeDelta(double seconds) {
-  double ms = seconds * base::Time::kMillisecondsPerSecond;
-  return base::TimeDelta::FromMilliseconds(static_cast<int64>(ms));
-}
-
-// Reports the collected boot times to UMA if they haven't been
-// reported yet and if metrics collection is enabled.
-static void SendBootTimesToUMA(const BootTimesLoader::BootTimes& boot_times) {
-  // Checks if the times for the most recent boot event have been
-  // reported already to avoid sending boot time histogram samples
-  // every time the user logs out.
-  static const base::FilePath::CharType kBootTimesSent[] =
-      FPL("/tmp/boot-times-sent");
-  base::FilePath sent(kBootTimesSent);
-  if (base::PathExists(sent))
-    return;
-
-  UMA_HISTOGRAM_TIMES("BootTime.Total",
-                      SecondsToTimeDelta(boot_times.total));
-  UMA_HISTOGRAM_TIMES("BootTime.Firmware",
-                      SecondsToTimeDelta(boot_times.firmware));
-  UMA_HISTOGRAM_TIMES("BootTime.Kernel",
-                      SecondsToTimeDelta(boot_times.pre_startup));
-  UMA_HISTOGRAM_TIMES("BootTime.System",
-                      SecondsToTimeDelta(boot_times.system));
-  if (boot_times.chrome > 0) {
-    UMA_HISTOGRAM_TIMES("BootTime.Chrome",
-                        SecondsToTimeDelta(boot_times.chrome));
-  }
-
-  // Stores the boot times to a file in /tmp to indicate that the
-  // times for the most recent boot event have been reported
-  // already. The file will be deleted at system shutdown/reboot.
-  std::string boot_times_text = base::StringPrintf("total: %.2f\n"
-                                                   "firmware: %.2f\n"
-                                                   "kernel: %.2f\n"
-                                                   "system: %.2f\n"
-                                                   "chrome: %.2f\n",
-                                                   boot_times.total,
-                                                   boot_times.firmware,
-                                                   boot_times.pre_startup,
-                                                   boot_times.system,
-                                                   boot_times.chrome);
-  file_util::WriteFile(sent, boot_times_text.data(), boot_times_text.size());
-  DCHECK(base::PathExists(sent));
-}
-
-void BootTimesLoader::Backend::GetBootTimesAndRunCallback(
-    const CancelableTaskTracker::IsCanceledCallback& is_canceled_cb,
-    const GetBootTimesCallback& callback) {
-  if (is_canceled_cb.Run())
-    return;
-
-  const base::FilePath::CharType kFirmwareBootTime[] =
-      FPL("firmware-boot-time");
-  const base::FilePath::CharType kPreStartup[] = FPL("pre-startup");
-  const base::FilePath::CharType kChromeExec[] = FPL("chrome-exec");
-  const base::FilePath::CharType kChromeMain[] = FPL("chrome-main");
-  const base::FilePath::CharType kXStarted[] = FPL("x-started");
-  const base::FilePath::CharType kLoginPromptReady[] =
-      FPL("login-prompt-ready");
-  const base::FilePath::StringType uptime_prefix = kUptimePrefix;
-
-  // Wait until firmware-boot-time file exists by reposting.
-  base::FilePath log_dir(kLogPath);
-  base::FilePath log_file = log_dir.Append(kFirmwareBootTime);
-  if (!base::PathExists(log_file)) {
-    BrowserThread::PostDelayedTask(
-        BrowserThread::FILE,
-        FROM_HERE,
-        base::Bind(&Backend::GetBootTimesAndRunCallback,
-                   this, is_canceled_cb, callback),
-        base::TimeDelta::FromMilliseconds(kReadAttemptDelayMs));
-    return;
-  }
-
-  BootTimes boot_times;
-
-  GetTime(kFirmwareBootTime, &boot_times.firmware);
-  GetTime(uptime_prefix + kPreStartup, &boot_times.pre_startup);
-  GetTime(uptime_prefix + kXStarted, &boot_times.x_started);
-  GetTime(uptime_prefix + kChromeExec, &boot_times.chrome_exec);
-  GetTime(uptime_prefix + kChromeMain, &boot_times.chrome_main);
-  GetTime(uptime_prefix + kLoginPromptReady, &boot_times.login_prompt_ready);
-
-  boot_times.total = boot_times.firmware + boot_times.login_prompt_ready;
-  if (boot_times.chrome_exec > 0) {
-    boot_times.system = boot_times.chrome_exec - boot_times.pre_startup;
-    boot_times.chrome = boot_times.login_prompt_ready - boot_times.chrome_exec;
-  } else {
-    boot_times.system = boot_times.login_prompt_ready - boot_times.pre_startup;
-  }
-
-  SendBootTimesToUMA(boot_times);
-
-  callback.Run(boot_times);
-}
-
 // Appends the given buffer into the file. Returns the number of bytes
 // written, or -1 on error.
 // TODO(satorux): Move this to file_util.