Revert 137960 - Base: Add power requirements to the System monitor.

base/system_monitor/system_monitor_win.cc

Index: base/system_monitor/system_monitor_win.cc
===================================================================
--- base/system_monitor/system_monitor_win.cc	(revision 137975)
+++ base/system_monitor/system_monitor_win.cc	(working copy)
@@ -1,111 +1,9 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/system_monitor/system_monitor.h"
-#include "base/utf_string_conversions.h"
-#include "base/win/windows_version.h"
 
-namespace {
-
-// Maps a request's reason to the handle and requests count.
-typedef std::map<std::string, std::pair<HANDLE, int> > HandleMap;
-
-#if _WIN32_WINNT <= _WIN32_WINNT_WIN7
-POWER_REQUEST_TYPE PowerRequestExecutionRequired =
-    static_cast<POWER_REQUEST_TYPE>(PowerRequestAwayModeRequired + 1);
-#endif
-
-POWER_REQUEST_TYPE PowerRequestTestRequired =
-    static_cast<POWER_REQUEST_TYPE>(PowerRequestExecutionRequired + 10);
-
-POWER_REQUEST_TYPE PowerRequirementToType(
-    base::SystemMonitor::PowerRequirement requirement) {
-  switch (requirement) {
-    case base::SystemMonitor::DISPLAY_REQUIRED:
-      return PowerRequestDisplayRequired;
-    case base::SystemMonitor::SYSTEM_REQUIRED:
-      return PowerRequestSystemRequired;
-    case base::SystemMonitor::CPU_REQUIRED:
-      return PowerRequestExecutionRequired;
-    case base::SystemMonitor::TEST_REQUIRED:
-      return PowerRequestTestRequired;
-  }
-  NOTREACHED();
-  return PowerRequestTestRequired;
-}
-
-HANDLE CreatePowerRequest(POWER_REQUEST_TYPE type, const std::string& reason) {
-  typedef HANDLE (WINAPI* PowerCreateRequestPtr)(PREASON_CONTEXT);
-  typedef BOOL (WINAPI* PowerSetRequestPtr)(HANDLE, POWER_REQUEST_TYPE);
-
-  if (type == PowerRequestTestRequired)
-    return NULL;
-
-  if (type == PowerRequestExecutionRequired &&
-      base::win::GetVersion() < base::win::VERSION_WIN8) {
-    return INVALID_HANDLE_VALUE;
-  }
-
-  static PowerCreateRequestPtr PowerCreateRequestFn = NULL;
-  static PowerSetRequestPtr PowerSetRequestFn = NULL;
-
-  if (!PowerCreateRequestFn || !PowerSetRequestFn) {
-    HMODULE module = GetModuleHandle(L"kernel32.dll");
-    PowerCreateRequestFn = reinterpret_cast<PowerCreateRequestPtr>(
-        GetProcAddress(module, "PowerCreateRequest"));
-    PowerSetRequestFn = reinterpret_cast<PowerSetRequestPtr>(
-        GetProcAddress(module, "PowerSetRequest"));
-
-    if (!PowerCreateRequestFn || !PowerSetRequestFn)
-      return INVALID_HANDLE_VALUE;
-  }
-  string16 wide_reason = ASCIIToUTF16(reason);
-  REASON_CONTEXT context = {0};
-  context.Version = POWER_REQUEST_CONTEXT_VERSION;
-  context.Flags = POWER_REQUEST_CONTEXT_SIMPLE_STRING;
-  context.Reason.SimpleReasonString = const_cast<wchar_t*>(wide_reason.c_str());
-
-  base::win::ScopedHandle handle(PowerCreateRequestFn(&context));
-  if (!handle.IsValid())
-    return INVALID_HANDLE_VALUE;
-
-  if (PowerSetRequestFn(handle, type))
-    return handle.Take();
-
-  // Something went wrong.
-  return INVALID_HANDLE_VALUE;
-}
-
-// Takes ownership of the |handle|.
-void DeletePowerRequest(POWER_REQUEST_TYPE type, HANDLE handle) {
-  if (type == PowerRequestTestRequired)
-    return;
-
-  base::win::ScopedHandle request_handle(handle);
-  if (!request_handle.IsValid())
-    return;
-
-  if (type == PowerRequestExecutionRequired &&
-      base::win::GetVersion() < base::win::VERSION_WIN8) {
-    return;
-  }
-
-  typedef BOOL (WINAPI* PowerClearRequestPtr)(HANDLE, POWER_REQUEST_TYPE);
-  HMODULE module = GetModuleHandle(L"kernel32.dll");
-  PowerClearRequestPtr PowerClearRequestFn =
-      reinterpret_cast<PowerClearRequestPtr>(
-          GetProcAddress(module, "PowerClearRequest"));
-
-  if (!PowerClearRequestFn)
-    return;
-
-  BOOL success = PowerClearRequest(request_handle, type);
-  DCHECK(success);
-}
-
-}  // namespace.
-
 namespace base {
 
 void SystemMonitor::ProcessWmPowerBroadcastMessage(int event_id) {
@@ -138,50 +36,6 @@
   ProcessPowerMessage(power_event);
 }
 
-void SystemMonitor::BeginPowerRequirement(PowerRequirement requirement,
-                                          const std::string& reason) {
-  thread_checker_.CalledOnValidThread();
-
-  HandleMap::iterator i = handles_.find(reason);
-  if (i != handles_.end()) {
-    // This is not the first request, just increase the requests count.
-    i->second.second++;
-    DCHECK_GT(i->second.second, 1);
-    return;
-  }
-
-  HANDLE handle = CreatePowerRequest(PowerRequirementToType(requirement),
-                                     reason);
-
-  if (handle != INVALID_HANDLE_VALUE)
-    handles_[reason] = std::pair<HANDLE, int>(handle, 1);
-}
-
-void SystemMonitor::EndPowerRequirement(PowerRequirement requirement,
-                                        const std::string& reason) {
-  thread_checker_.CalledOnValidThread();
-
-  HandleMap::iterator i = handles_.find(reason);
-  if (i == handles_.end()) {
-    NOTREACHED();
-    return;
-  }
-
-  // Decrease the requests count and see if this the last request.
-  i->second.second--;
-  DCHECK_GE(i->second.second, 0);
-
-  if (i->second.second)
-    return;
-
-  DeletePowerRequest(PowerRequirementToType(requirement), i->second.first);
-  handles_.erase(i);
-}
-
-size_t SystemMonitor::GetPowerRequirementsCountForTest() const {
-  return handles_.size();
-}
-
 // Function to query the system to see if it is currently running on
 // battery power.  Returns true if running on battery.
 bool SystemMonitor::IsBatteryPower() {