media: Make MediaKeys ref-counted.

content/browser/media/media_web_contents_observer.cc

 // 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.
 
 #include "content/browser/media/media_web_contents_observer.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "content/browser/media/cdm/browser_cdm_manager.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
@@ skipping 123 matching lines @@
   }
 
   // MediaPlayerAndroid runs on the same thread as BrowserCdmManager.
   BrowserCdmManager* browser_cdm_manager =
       BrowserCdmManager::FromProcess(render_frame_host->GetProcess()->GetID());
   if (!browser_cdm_manager) {
     NOTREACHED() << "OnSetCdm: CDM not found for " << cdm_id;
     return;
   }
 
-  media::BrowserCdm* cdm =
+  scoped_refptr<media::MediaKeys> cdm =
       browser_cdm_manager->GetCdm(render_frame_host->GetRoutingID(), cdm_id);
   if (!cdm) {
     NOTREACHED() << "OnSetCdm: CDM not found for " << cdm_id;
     return;
   }
 
   // TODO(xhwang): This could possibly fail. In that case we should reject the
   // promise.
   media_player->SetCdm(cdm);
 }
@@ skipping 15 matching lines @@
       iter != media_player_managers_.end(); ++iter) {
     BrowserMediaPlayerManager* manager = iter->second;
     manager->OnFrameInfoUpdated();
   }
 }
 #endif  // defined(VIDEO_HOLE)
 
 #endif  // defined(OS_ANDROID)
 
 }  // namespace content