[Mojo Video Capture] Add content_browsertest for exercising video capture

content/browser/renderer_host/media/media_stream_provider.h

Index: content/browser/renderer_host/media/media_stream_provider.h
diff --git a/content/browser/renderer_host/media/media_stream_provider.h b/content/browser/renderer_host/media/media_stream_provider.h
index 69e7dab3c821a7a9002204aaf385d2a61d7e35ab..6131c9c66da98f5c7d29a85fff60514b935af5e3 100644
--- a/content/browser/renderer_host/media/media_stream_provider.h
+++ b/content/browser/renderer_host/media/media_stream_provider.h
@@ -58,13 +58,13 @@ class CONTENT_EXPORT MediaStreamProvider
   virtual void RegisterListener(MediaStreamProviderListener* listener) = 0;
 
   // Unregisters a previously registered listener.
-  virtual void UnregisterListener() = 0;
+  virtual void UnregisterListener(MediaStreamProviderListener* listener) = 0;
 
   // Opens the specified device. The device is not started and it is still
   // possible for other applications to open the device before the device is
   // started. |Opened| is called when the device is opened.
   // kInvalidMediaCaptureSessionId is returned on error.
-  virtual int Open(const StreamDeviceInfo& device) = 0;
+  virtual int Open(const MediaStreamDevice& device) = 0;
 
   // Closes the specified device and calls |Closed| when done.
   virtual void Close(int capture_session_id) = 0;