Deleted OS_WIN and all Windows specific files from base.

base/power_monitor/power_monitor_device_source.h

Index: base/power_monitor/power_monitor_device_source.h
diff --git a/base/power_monitor/power_monitor_device_source.h b/base/power_monitor/power_monitor_device_source.h
index 29f17c2a7d96b95903f43d8be78da5554068bd1b..977bd267e511c43cf92906e2b51f38c51392af6d 100644
--- a/base/power_monitor/power_monitor_device_source.h
+++ b/base/power_monitor/power_monitor_device_source.h
@@ -12,15 +12,7 @@
 #include "base/power_monitor/power_monitor_source.h"
 #include "base/power_monitor/power_observer.h"
 
-#if defined(OS_WIN)
-#include <windows.h>
-
-// Windows HiRes timers drain the battery faster so we need to know the battery
-// status.  This isn't true for other platforms.
-#define ENABLE_BATTERY_MONITORING 1
-#else
 #undef ENABLE_BATTERY_MONITORING
-#endif  // !OS_WIN
 
 #if defined(ENABLE_BATTERY_MONITORING)
 #include "base/timer/timer.h"
@@ -62,25 +54,6 @@ class BASE_EXPORT PowerMonitorDeviceSource : public PowerMonitorSource {
 #endif
 
  private:
-#if defined(OS_WIN)
-  // Represents a message-only window for power message handling on Windows.
-  // Only allow PowerMonitor to create it.
-  class PowerMessageWindow {
-   public:
-    PowerMessageWindow();
-    ~PowerMessageWindow();
-
-   private:
-    static LRESULT CALLBACK WndProcThunk(HWND hwnd,
-                                         UINT message,
-                                         WPARAM wparam,
-                                         LPARAM lparam);
-    // Instance of the module containing the window procedure.
-    HMODULE instance_;
-    // A hidden message-only window.
-    HWND message_hwnd_;
-  };
-#endif  // OS_WIN
 
 #if defined(OS_MACOSX)
   void PlatformInit();
@@ -105,10 +78,6 @@ class BASE_EXPORT PowerMonitorDeviceSource : public PowerMonitorSource {
   base::OneShotTimer<PowerMonitorDeviceSource> delayed_battery_check_;
 #endif
 
-#if defined(OS_WIN)
-  PowerMessageWindow power_message_window_;
-#endif
-
   DISALLOW_COPY_AND_ASSIGN(PowerMonitorDeviceSource);
 };