Ignore malformed arguments to --original-process-start-time.

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 4fb445330ad0c6fdf0991e928acee0aa2f0229d0..d6a6b38ac7a6d4f69fe9c825c7ab941bd3732700 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -430,10 +430,11 @@ bool ProcessSingletonNotificationCallback(
     std::string start_time_string =
         command_line.GetSwitchValueASCII(switches::kOriginalProcessStartTime);
     int64 remote_start_time;
-    base::StringToInt64(start_time_string, &remote_start_time);
-    UMA_HISTOGRAM_LONG_TIMES(
-        "Startup.WarmStartTimeFromRemoteProcessStart",
-        base::Time::Now() - base::Time::FromInternalValue(remote_start_time));
+    if (base::StringToInt64(start_time_string, &remote_start_time)) {
+      UMA_HISTOGRAM_LONG_TIMES(
+          "Startup.WarmStartTimeFromRemoteProcessStart",
+          base::Time::Now() - base::Time::FromInternalValue(remote_start_time));
+    }
   }
 
   g_browser_process->platform_part()->PlatformSpecificCommandLineProcessing(