Fix races in MediaStream video constraints tests.

content/renderer/media/media_stream_video_capturer_source.h

 // 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 28 matching lines @@
   MediaStreamVideoCapturerSource(
       const SourceStoppedCallback& stop_callback,
       const StreamDeviceInfo& device_info,
       const media::VideoCaptureParams& capture_params,
       RenderFrame* render_frame);
   ~MediaStreamVideoCapturerSource() override;
 
  private:
   friend class CanvasCaptureHandlerTest;
   friend class MediaStreamVideoCapturerSourceTest;
+  friend class MediaStreamVideoCapturerSourceOldConstraintsTest;
 
   // MediaStreamVideoSource overrides.
   void RequestRefreshFrame() override;
   void OnHasConsumers(bool has_consumers) override;
   void OnCapturingLinkSecured(bool is_secure) override;
   void GetCurrentSupportedFormats(
       int max_requested_width,
       int max_requested_height,
       double max_requested_frame_rate,
       const VideoCaptureDeviceFormatsCB& callback) override;
@@ skipping 22 matching lines @@
   bool is_capture_starting_ = false;
 
   media::VideoCaptureParams capture_params_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoCapturerSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_