Move DeviceOrientation / DeviceMotion event handlers to device_orientation module

Source/modules/device_orientation/DOMWindowDeviceMotion.h

Index: Source/modules/device_orientation/DOMWindowDeviceMotion.h
diff --git a/Source/modules/device_orientation/DOMWindowDeviceMotion.h b/Source/modules/device_orientation/DOMWindowDeviceMotion.h
new file mode 100644
index 0000000000000000000000000000000000000000..e9b96f5bb9c11643437f5f333814a0658b0d8172
--- /dev/null
+++ b/Source/modules/device_orientation/DOMWindowDeviceMotion.h
@@ -0,0 +1,19 @@
+// 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 DOMWindowDeviceMotion_h
+#define DOMWindowDeviceMotion_h
+
+#include "core/events/EventTarget.h"
+
+namespace WebCore {
+
+class DOMWindowDeviceMotion {
+public:
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(devicemotion);
+};
+
+} // namespace WebCore
+
+#endif // DOMWindowDeviceMotion_h