Move DeviceOrientation / DeviceMotion event handlers to device_orientation module

Source/modules/device_orientation/DOMWindowDeviceOrientation.h

+// Copyright 2014 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.
+
+#ifndef DOMWindowDeviceOrientation_h
+#define DOMWindowDeviceOrientation_h
+
+#include "core/events/EventTarget.h"
+
+namespace WebCore {
+
+class DOMWindowDeviceOrientation {
+public:
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(deviceorientation);
+};
+
+} // namespace WebCore
+
+#endif // DOMWindowDeviceOrientation_h