SystemMonitor refactoring: move power state monitor into a separate class called PowerMonitor

content/browser/browser_main_loop.h

Index: content/browser/browser_main_loop.h
diff --git a/content/browser/browser_main_loop.h b/content/browser/browser_main_loop.h
index 6f5abe5c67cfee323979558644430b08e22871e3..80525648782dc162ef3d248fe0362bbd94caeb14 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -20,6 +20,7 @@ class MessageLoop;
 class SystemMessageWindowWin;
 
 namespace base {
+class PowerStateManager;
 class SystemMonitor;
 }
 
@@ -102,6 +103,7 @@ class BrowserMainLoop {
 
   // Members initialized in |MainMessageLoopStart()| ---------------------------
   scoped_ptr<MessageLoop> main_message_loop_;
+  scoped_ptr<base::PowerStateManager> power_state_manager_;
   scoped_ptr<base::SystemMonitor> system_monitor_;
   scoped_ptr<HighResolutionTimerManager> hi_res_timer_manager_;
   scoped_ptr<net::NetworkChangeNotifier> network_change_notifier_;