[DeviceService] Mojofy left screen orientation IPC messages.

content/common/screen_orientation_messages.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.
 
 // IPC messages for screen orientation.
 // Multiply-included message file, hence no include guard.
 
 #include "content/common/content_export.h"
 #include "ipc/ipc_message_macros.h"
 #include "third_party/WebKit/public/platform/modules/screen_orientation/WebLockOrientationError.h"
 #include "third_party/WebKit/public/platform/modules/screen_orientation/WebScreenOrientationLockType.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 
 #define IPC_MESSAGE_START ScreenOrientationMsgStart
 
 // Only used by content/common/manifest_manager_messages.h.
 IPC_ENUM_TRAITS_MIN_MAX_VALUE(blink::WebScreenOrientationLockType,
                               blink::WebScreenOrientationLockDefault,
                               blink::WebScreenOrientationLockNatural)
-
-// The renderer process is now using the Screen Orientation API and informs the
-// browser process that it should start accurately listening to the screen
-// orientation if it wasn't already.
-// This is only expected to be acted upon when the underlying platform requires
-// heavy work in order to accurately know the screen orientation.
-IPC_MESSAGE_CONTROL0(ScreenOrientationHostMsg_StartListening)
-
-// The renderer process is no longer using the Screen Orientation API and
-// informs the browser process that it can stop accurately listening to the
-// screen orientation if no other process cares about it.
-// This is only expected to be acted upon when the underlying platform requires
-// heavy work in order to accurately know the screen orientation.
-IPC_MESSAGE_CONTROL0(ScreenOrientationHostMsg_StopListening)