Delete MediaStreamManager in the same way as AudioManager

content/browser/renderer_host/media/video_capture_manager.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/renderer_host/media/video_capture_manager.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/stl_util.h"
@@ skipping 41 matching lines @@
 void VideoCaptureManager::Register(MediaStreamProviderListener* listener,
                                    base::MessageLoopProxy* device_thread_loop) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(!listener_);
   DCHECK(!device_loop_);
   listener_ = listener;
   device_loop_ = device_thread_loop;
 }
 
 void VideoCaptureManager::Unregister() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(listener_);
   listener_ = NULL;
 }
 
 void VideoCaptureManager::EnumerateDevices() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(listener_);
   device_loop_->PostTask(
       FROM_HERE,
       base::Bind(&VideoCaptureManager::OnEnumerateDevices, this));
@@ skipping 428 matching lines @@
 
     VideoCaptureDevices::iterator dit = devices_.find(capture_session_id);
     if (dit != devices_.end()) {
       return dit->second;
     }
   }
   return NULL;
 }
 
 }  // namespace media_stream