Make VideoCaptureController single-threaded and not ref counted.

content/browser/renderer_host/media/web_contents_video_capture_device.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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 #include "media/video/capture/video_capture_device.h"
 
 namespace content {
 
 class RenderWidgetHost;
 
 // A virtualized VideoCaptureDevice that mirrors the displayed contents of a
 // tab (accessed via its associated WebContents instance), producing a stream of
 // video frames.
 //
 // An instance is created by providing a device_id.  The device_id contains the
 // routing ID for a RenderViewHost, and from the RenderViewHost instance, a
 // reference to its associated WebContents instance is acquired.  From then on,
 // WebContentsVideoCaptureDevice will capture from whatever render view is
 // currently associated with that WebContents instance.  This allows the
 // underlying render view to be swapped out (e.g., due to navigation or
 // crashes/reloads), without any interruption in capturing.
 class CONTENT_EXPORT WebContentsVideoCaptureDevice
-    : public media::VideoCaptureDevice {
+    : public media::VideoCaptureDevice1 {
  public:
   // Construct from a |device_id| string of the form:
   //   "virtual-media-stream://render_process_id:render_view_id", where
   // |render_process_id| and |render_view_id| are decimal integers.
   // |destroy_cb| is invoked on an outside thread once all outstanding objects
   // are completely destroyed -- this will be some time after the
   // WebContentsVideoCaptureDevice is itself deleted.
   // TODO(miu): Passing a destroy callback suggests needing to revisit the
   // design philosophy of an asynchronous DeAllocate().  http://crbug.com/158641
-  static media::VideoCaptureDevice* Create(const std::string& device_id);
+  static media::VideoCaptureDevice1* Create(const std::string& device_id);
 
   virtual ~WebContentsVideoCaptureDevice();
 
   // VideoCaptureDevice implementation.
   virtual void Allocate(const media::VideoCaptureCapability& capture_format,
                         VideoCaptureDevice::EventHandler* observer) OVERRIDE;
   virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void DeAllocate() OVERRIDE;
 
@@ skipping 13 matching lines @@
   Name device_name_;
   const scoped_ptr<Impl> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsVideoCaptureDevice);
 };
 
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_