Decouple PowerUsageMonitor{Impl} from //content/browser

chrome/browser/chrome_browser_main.h

Index: chrome/browser/chrome_browser_main.h
diff --git a/chrome/browser/chrome_browser_main.h b/chrome/browser/chrome_browser_main.h
index ac0b4fed3961ed0631902070285e6969d3a34452..625faa55f3a34669e78bce91ddd912a43b678fa6 100644
--- a/chrome/browser/chrome_browser_main.h
+++ b/chrome/browser/chrome_browser_main.h
@@ -16,6 +16,7 @@
 #include "chrome/browser/chrome_browser_field_trials.h"
 #include "chrome/browser/chrome_process_singleton.h"
 #include "chrome/browser/first_run/first_run.h"
+#include "chrome/browser/power_usage_monitor/power_usage_monitor.h"
 #include "chrome/browser/process_singleton.h"
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
 #include "chrome/common/stack_sampling_configuration.h"
@@ -174,6 +175,10 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
   // ProcessSingleton.
   std::unique_ptr<ChromeProcessSingleton> process_singleton_;
 
+#if !defined(OS_LINUX) || defined(OS_CHROMEOS)  // http://crbug.com/426393
+  std::unique_ptr<PowerUsageMonitor> power_usage_monitor_;
+#endif  // !defined(OS_LINUX) || defined(OS_CHROMEOS)
+
   // Android's first run is done in Java instead of native.
   std::unique_ptr<first_run::MasterPrefs> master_prefs_;