[Cross-Site Isolation] Migrate entire MediaStream verticals to be per-RenderFrame.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index dfb30be774a402e688c1945afc455747f18de56a..212d522c56d7101949ce353ff80b0093c55172dd 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -58,6 +58,8 @@ namespace content {
 
 class ChildFrameCompositingHelper;
 class GeolocationDispatcher;
+class MediaStreamDispatcher;
+class MediaStreamImpl;
 class MediaStreamRendererFactory;
 class MidiDispatcher;
 class NotificationProvider;
@@ -201,6 +203,10 @@ class CONTENT_EXPORT RenderFrameImpl
     bool keep_selection);
 #endif  // ENABLE_PLUGINS
 
+  // May return NULL in some cases, especially if userMediaClient() returns
+  // NULL.
+  MediaStreamDispatcher* GetMediaStreamDispatcher();
+
   // IPC::Sender
   virtual bool Send(IPC::Message* msg) OVERRIDE;
 
@@ -528,10 +534,10 @@ class CONTENT_EXPORT RenderFrameImpl
                                const blink::WebURLError& error,
                                bool replace);
 
-  // Initializes |web_user_media_client_|, returning true if successful. Returns
-  // false if it wasn't possible to create a MediaStreamClient (e.g., WebRTC is
-  // disabled) in which case |web_user_media_client_| is NULL.
-  bool InitializeUserMediaClient();
+  // Initializes |web_user_media_client_|. If this fails, because it wasn't
+  // possible to create a MediaStreamClient (e.g., WebRTC is disabled), then
+  // |web_user_media_client_| will remain NULL.
+  void InitializeUserMediaClient();
 
   blink::WebMediaPlayer* CreateWebMediaPlayerForMediaStream(
       const blink::WebURL& url,
@@ -619,7 +625,8 @@ class CONTENT_EXPORT RenderFrameImpl
   // Holds a reference to the service which provides desktop notifications.
   NotificationProvider* notification_provider_;
 
-  blink::WebUserMediaClient* web_user_media_client_;
+  // Destroyed via the RenderFrameObserver::OnDestruct() mechanism.
+  MediaStreamImpl* web_user_media_client_;
 
   // MidiClient attached to this frame; lazily initialized.
   MidiDispatcher* midi_dispatcher_;