Revert 156744 - chromeos: Use EventRouterForwarder to disptch systemPrivate extension events

chrome/browser/extensions/system/system_api.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This extension API contains system-wide preferences and functions that shall
 // be only available to component extensions.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_SYSTEM_SYSTEM_API_H_
 #define CHROME_BROWSER_EXTENSIONS_SYSTEM_SYSTEM_API_H_
 
@@ skipping 17 matching lines @@
  public:
   DECLARE_EXTENSION_FUNCTION_NAME("systemPrivate.getUpdateStatus")
 
  protected:
   virtual ~GetUpdateStatusFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 };
 
-// Dispatches systemPrivate.onBrightnessChanged event for extensions.
 void DispatchBrightnessChangedEvent(int brightness, bool user_initiated);
-
-// Dispatches systemPrivate.onVolumeChanged event for extensions.
 void DispatchVolumeChangedEvent(double volume, bool is_volume_muted);
-
-// Dispatches systemPrivate.onScreenChanged event for extensions.
 void DispatchScreenUnlockedEvent();
-
-// Dispatches systemPrivate.onWokeUp event for extensions.
 void DispatchWokeUpEvent();
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SYSTEM_SYSTEM_API_H_