Cleanup unused class/includes device(motion|orientation)

content/browser/device_sensors/device_motion_message_filter.h

Index: content/browser/device_sensors/device_motion_message_filter.h
diff --git a/content/browser/device_sensors/device_motion_message_filter.h b/content/browser/device_sensors/device_motion_message_filter.h
index 71ba38c2678308ebf6a6aaedb11effb694b3fffb..cd4859472d57684add705b648d02caa8fdc13cb6 100644
--- a/content/browser/device_sensors/device_motion_message_filter.h
+++ b/content/browser/device_sensors/device_motion_message_filter.h
@@ -5,14 +5,10 @@
 #ifndef CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_MOTION_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_MOTION_MESSAGE_FILTER_H_
 
-#include "base/compiler_specific.h"
 #include "content/public/browser/browser_message_filter.h"
 
 namespace content {
 
-class DeviceMotionService;
-class RenderProcessHost;
-
 class DeviceMotionMessageFilter : public BrowserMessageFilter {
  public:
   DeviceMotionMessageFilter();