Make RendererMediaPlayerManager a RenderFrameObserver.

content/browser/web_contents/web_contents_impl.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 3281 matching lines @@
     ToggleFullscreenMode(false);
 
   // Cancel any visible dialogs so they are not left dangling over the sad tab.
   if (dialog_manager_)
     dialog_manager_->CancelActiveAndPendingDialogs(this);
 
   SetIsLoading(rvh, false, true, NULL);
   NotifyDisconnected();
   SetIsCrashed(status, error_code);
 
-#if defined(OS_ANDROID)
-  if (GetRenderViewHostImpl()->media_player_manager())
-    GetRenderViewHostImpl()->media_player_manager()->DestroyAllMediaPlayers();

[xhwang, 2014/05/12 17:01:58]

This should be taken care of by MediaWebContentsObserver::RenderFrameDeleted().

-#endif
-
   FOR_EACH_OBSERVER(WebContentsObserver,
                     observers_,
                     RenderProcessGone(GetCrashedStatus()));
 }
 
 void WebContentsImpl::RenderViewDeleted(RenderViewHost* rvh) {
   GetRenderManager()->RenderViewDeleted(rvh);
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, RenderViewDeleted(rvh));
 }
 
@@ skipping 658 matching lines @@
 
 void WebContentsImpl::OnPreferredSizeChanged(const gfx::Size& old_size) {
   if (!delegate_)
     return;
   const gfx::Size new_size = GetPreferredSize();
   if (new_size != old_size)
     delegate_->UpdatePreferredSize(this, new_size);
 }
 
 }  // namespace content