[Media Router] Use origin instead of URL for frame.

chrome/browser/ui/webui/media_router/media_router_ui.cc

 // 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.
 
 #include "chrome/browser/ui/webui/media_router/media_router_ui.h"
 
 #include <algorithm>
 #include <string>
 #include <unordered_map>
 #include <utility>
@@ skipping 403 matching lines @@
   bool for_default_source = cast_mode == MediaCastMode::DEFAULT;
   if (for_default_source && !presentation_request_) {
     DLOG(ERROR) << "Requested to create a route for presentation, but "
                 << "presentation request is missing.";
     return false;
   }
 
   current_route_request_id_ = ++route_request_counter_;
   *origin = for_default_source ? presentation_request_->frame_url().GetOrigin()
                                : GURL(chrome::kChromeUIMediaRouterURL);
-  DCHECK(origin->is_valid());
-
   DVLOG(1) << "DoCreateRoute: origin: " << *origin;
 
   // There are 3 cases. In cases (1) and (3) the MediaRouterUI will need to be
   // notified. In case (2) the dialog will be closed.
   // (1) Non-presentation route request (e.g., mirroring). No additional
   // notification necessary.
   // (2) Presentation route request for a Presentation API startSession call.
   // The startSession (CreatePresentationConnectionRequest) will need to be
   // answered with the route response.
   // (3) Browser-initiated presentation route request. If successful,
@@ skipping 256 matching lines @@
         base::Time::Now() - start_time_);
     start_time_ = base::Time();
   }
 }
 
 void MediaRouterUI::UpdateMaxDialogHeight(int height) {
   handler_->UpdateMaxDialogHeight(height);
 }
 
 }  // namespace media_router