[Media Router] Convert MediaRouter to use GURL for presentation URLs.

chrome/browser/media/router/media_router.h

 // Copyright 2015 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 CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 47 matching lines @@
 // updates, handling route requests/responses, and operating on routes (e.g.
 // posting messages or closing).
 // TODO(imcheng): Reduce number of parameters by putting them into structs.
 class MediaRouter : public KeyedService {
  public:
   using SendRouteMessageCallback = base::Callback<void(bool sent)>;
 
   ~MediaRouter() override = default;
 
   // Creates a media route from |source_id| to |sink_id|.
-  // |origin| is the URL of requestor's page.
+  // |origin| is the origin of requestor's page.
   // |web_contents| is the WebContents of the tab in which the request was made.
   // |origin| and |web_contents| are used for enforcing same-origin and/or
   // same-tab scope for JoinRoute() requests. (e.g., if enforced, the page
   // requesting JoinRoute() must have the same origin as the page that requested
   // CreateRoute()).
   // The caller may pass in nullptr for |web_contents| if tab is not applicable.
   // Each callback in |callbacks| is invoked with a response indicating
   // success or failure, in the order they are listed.
   // If |timeout| is positive, then any un-invoked |callbacks| will be invoked
   // with a timeout error after the timeout expires.
@@ skipping 160 matching lines @@
 
   // Unregisters a previously registered RouteMessagesObserver. |observer| will
   // stop receiving further updates.
   virtual void UnregisterRouteMessageObserver(
       RouteMessageObserver* observer) = 0;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_H_