Move power event handling logic from ui/ to base/ on Windows

base/system_monitor/system_monitor.h

Index: base/system_monitor/system_monitor.h
diff --git a/base/system_monitor/system_monitor.h b/base/system_monitor/system_monitor.h
index 6620d27b42d109a65ceb86aaefe730f5e75dd07f..919c807ba64309765e727b25e46aaed875d0e4f5 100644
--- a/base/system_monitor/system_monitor.h
+++ b/base/system_monitor/system_monitor.h
@@ -134,13 +134,6 @@ class BASE_EXPORT SystemMonitor {
   // be copied. Any significant addition to this class is blocked on
   // refactoring to improve the state of affairs. See http://crbug.com/149059
 
-#if defined(OS_WIN)
-  // Windows-specific handling of a WM_POWERBROADCAST message.
-  // Embedders of this API should hook their top-level window
-  // message loop and forward WM_POWERBROADCAST through this call.
-  void ProcessWmPowerBroadcastMessage(int event_id);
-#endif
-
   // Cross-platform handling of a power event.
   void ProcessPowerMessage(PowerEvent event_id);
 
@@ -153,6 +146,13 @@ class BASE_EXPORT SystemMonitor {
   void PlatformDestroy();
 #endif
 
+#if defined(OS_WIN)
+  // Represents a message-only window for power message handling on Windows.
+  // Only allow SystemMonitor to create it.
+  class PowerMessageWindow;

[vandebo (ex-Chrome), 2013/02/23 01:14:53]

style guide says this should go on line 144.

[Hongbo Min, 2013/02/23 03:42:01]

Done.

+  scoped_ptr<PowerMessageWindow> power_message_window_;

[vandebo (ex-Chrome), 2013/02/23 01:14:53]

style guide says this should go on line 185.

[Hongbo Min, 2013/02/23 03:42:01]

Done.

+#endif
+
   // Platform-specific method to check whether the system is currently
   // running on battery power.  Returns true if running on batteries,
   // false otherwise.