Make RendererMediaPlayerManager a RenderFrameObserver.

content/common/view_messages.h

 // Copyright (c) 2012 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 page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ skipping 928 matching lines @@
 IPC_MESSAGE_ROUTED0(ViewMsg_ShowImeIfNeeded)
 
 // Sent by the browser when the renderer should generate a new frame.
 IPC_MESSAGE_ROUTED1(ViewMsg_BeginFrame,
                     cc::BeginFrameArgs /* args */)
 
 // Sent by the browser when an IME update that requires acknowledgement has been
 // processed on the browser side.
 IPC_MESSAGE_ROUTED0(ViewMsg_ImeEventAck)
 
-// Sent by the browser when we should pause video playback.
-IPC_MESSAGE_ROUTED0(ViewMsg_PauseVideo);
-
 // Extracts the data at the given rect, returning it through the
 // ViewHostMsg_SmartClipDataExtracted IPC.
 IPC_MESSAGE_ROUTED1(ViewMsg_ExtractSmartClipData,
                     gfx::Rect /* rect */)
 
 #elif defined(OS_MACOSX)
 // Let the RenderView know its window has changed visibility.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetWindowVisibility,
                     bool /* visibile */)
 
@@ skipping 785 matching lines @@
 // synchronously (see crbug.com/120597). This IPC message sends the character
 // bounds after every composition change to always have correct bound info.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_ImeCompositionRangeChanged,
                     gfx::Range /* composition range */,
                     std::vector<gfx::Rect> /* character bounds */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.