Move WebDevice{Motion|Orientation} related Blink API headers into their own

public/platform/Platform.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 
 #ifdef WIN32
 #include <windows.h>
 #endif
 
 #include "WebAudioDevice.h"
 #include "WebBatteryStatusListener.h"
 #include "WebCommon.h"
 #include "WebData.h"
 #include "WebDeviceLightListener.h"
-#include "WebDeviceMotionListener.h"
-#include "WebDeviceOrientationListener.h"
 #include "WebGamepadListener.h"
 #include "WebGamepads.h"
 #include "WebGestureDevice.h"
 #include "WebGraphicsContext3D.h"
 #include "WebLocalizedString.h"
 #include "WebPlatformEventType.h"
 #include "WebSize.h"
 #include "WebSpeechSynthesizer.h"
 #include "WebStorageQuotaCallbacks.h"
 #include "WebStorageQuotaType.h"
@@ skipping 631 matching lines @@
 protected:
     BLINK_PLATFORM_EXPORT Platform();
     virtual ~Platform() { }
 
     WebThread* m_mainThread;
 };
 
 } // namespace blink
 
 #endif