[Media Router] Move main frame check for SetDefaultPresentationUrls.

content/browser/presentation/presentation_service_impl.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 "content/browser/presentation/presentation_service_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <algorithm>
 #include <utility>
@@ skipping 280 matching lines @@
 
   DCHECK(it->second.get());
   it->second->Run(presentation_info, error);
   pending_reconnect_presentation_cbs_.erase(it);
   return true;
 }
 
 void PresentationServiceImpl::SetDefaultPresentationUrls(
     const std::vector<GURL>& presentation_urls) {
   DVLOG(2) << "SetDefaultPresentationUrls";
-  if (!controller_delegate_)
+  if (!controller_delegate_ || !is_main_frame_)
     return;
 
   if (default_presentation_urls_ == presentation_urls)
     return;
 
   default_presentation_urls_ = presentation_urls;
   controller_delegate_->SetDefaultPresentationUrls(
       render_process_id_, render_frame_id_, presentation_urls,
       base::Bind(&PresentationServiceImpl::OnDefaultPresentationStarted,
                  weak_factory_.GetWeakPtr()));
@@ skipping 182 matching lines @@
 }
 
 void PresentationServiceImpl::NewPresentationCallbackWrapper::Run(
     const base::Optional<PresentationInfo>& presentation_info,
     const base::Optional<PresentationError>& error) {
   DCHECK(!callback_.is_null());
   std::move(callback_).Run(presentation_info, error);
 }
 
 }  // namespace content