Migrate MediaStream test code from content/shell/renderer/ to content/test/.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 9ed12ad42e98019e8df11c68c76811f4d664edd0..1378c57088269100702b823d15cca330943ca439 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -53,14 +53,10 @@ class PpapiInterfaceFactoryManager;
 struct WebPluginInfo;
 }
 
-namespace webkit_media {
-class MediaLoadDelegate;
-class MediaStreamClient;
-}
-
 namespace content {
 
 class RenderView;
+class MediaStreamClient;
 class SynchronousCompositor;
 
 // Embedder API for participating in renderer logic.
@@ -143,7 +139,7 @@ class CONTENT_EXPORT ContentRendererClient {
 
   // Allows the embedder to override creating a MediaStreamClient. If it returns
   // NULL the content layer will create the media stream client.
-  virtual webkit_media::MediaStreamClient* OverrideCreateMediaStreamClient();
+  virtual MediaStreamClient* OverrideCreateMediaStreamClient();
 
   // Allows the embedder to override creating a WebMIDIAccessor.  If it
   // returns NULL the content layer will create the MIDI accessor.