[chrome.displaySource] Move mojo interfaces to a nested namespace.

extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.cc

 // Copyright 2016 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 "extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.h"
 
 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "base/task_runner_util.h"
 #include "content/public/renderer/media_stream_utils.h"
@@ skipping 456 matching lines @@
     return;
   }
 
   if (is_playing_)
     Play();
 }
 
 // Note: invoked on IO thread
 void WiFiDisplayMediaManager::RegisterMediaService(
     const scoped_refptr<base::SingleThreadTaskRunner>& main_runner,
-    WiFiDisplayMediaServiceRequest request,
+    mojom::WiFiDisplayMediaServiceRequest request,
     const base::Closure& on_completed) {
   auto connect_service_callback =
       base::Bind(&WiFiDisplayMediaManager::ConnectToRemoteService,
                  base::Unretained(this),
                  base::Passed(&request));
   main_runner->PostTaskAndReply(FROM_HERE,
       connect_service_callback,
       media::BindToCurrentLoop(on_completed));
 }
 
 void WiFiDisplayMediaManager::ConnectToRemoteService(
-    WiFiDisplayMediaServiceRequest request) {
+    mojom::WiFiDisplayMediaServiceRequest request) {
   DCHECK(content::RenderThread::Get());
   interface_provider_->GetInterface(std::move(request));
 }
 
 }  // namespace extensions