Make tab capture media stream requests verify that the request came from extension API

chrome/browser/extensions/extension_host.h

Index: chrome/browser/extensions/extension_host.h
diff --git a/chrome/browser/extensions/extension_host.h b/chrome/browser/extensions/extension_host.h
index ede9387037e4ac727eeef25c7e803097172ef934..9c0e247edbde463b6c5c8d13070f2ed54617f4c1 100644
--- a/chrome/browser/extensions/extension_host.h
+++ b/chrome/browser/extensions/extension_host.h
@@ -171,6 +171,10 @@ class ExtensionHost : public content::WebContentsDelegate,
   virtual void WebIntentDispatch(
       content::WebContents* web_contents,
       content::WebIntentsDispatcher* intents_dispatcher) OVERRIDE;
+  virtual void RequestMediaAccessPermission(
+      content::WebContents* web_contents,
+      const content::MediaStreamRequest* request,
+      const content::MediaResponseCallback& callback) OVERRIDE;
 
   // content::NotificationObserver
   virtual void Observe(int type,