media: Use mojo::StrongBinding in mojo media services.

content/browser/frame_host/render_frame_host_impl.cc

 // Copyright 2013 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/frame_host/render_frame_host_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
@@ skipping 1503 matching lines @@
   RenderViewHostDelegateView* view =
       render_view_host_->delegate_->GetDelegateView();
   if (view)
     view->HidePopupMenu();
 }
 #endif
 
 #if defined(ENABLE_MEDIA_MOJO_RENDERER)
 static void CreateMediaRendererService(
     mojo::InterfaceRequest<mojo::MediaRenderer> request) {
-  media::MojoRendererService* service = new media::MojoRendererService();
-  mojo::BindToRequest(service, &request);
+  // The created object is strongly bound to (and owned by) the pipe.

[jam, 2015/05/20 15:02:23]

isn't "strongly bound" and "owned by" redundant? I would just say "The created
object is owned by the pipe".

[xhwang, 2015/05/20 18:19:34]

Done.

+  new media::MojoRendererService(request.Pass());
 }
 #endif
 
 void RenderFrameHostImpl::RegisterMojoServices() {
   GeolocationServiceContext* geolocation_service_context =
       delegate_ ? delegate_->GetGeolocationServiceContext() : NULL;
   if (geolocation_service_context) {
     // TODO(creis): Bind process ID here so that GeolocationServiceImpl
     // can perform permissions checks once site isolation is complete.
     // crbug.com/426384
@@ skipping 531 matching lines @@
   // We may be returning to an existing NavigationEntry that had been granted
   // file access.  If this is a different process, we will need to grant the
   // access again.  The files listed in the page state are validated when they
   // are received from the renderer to prevent abuse.
   if (request_params.page_state.IsValid()) {
     render_view_host_->GrantFileAccessFromPageState(request_params.page_state);
   }
 }
 
 }  // namespace content