Create and use mojo::Binding on the same thread.

Review URL: https://codereview.chromium.org/1517753002

Cr-Commit-Position: refs/heads/master@{#364448}

media/mojo/services/mojo_renderer_impl.cc

@@ -21,7 +21,6 @@ MojoRendererImpl::MojoRendererImpl(
     interfaces::RendererPtr remote_renderer)
     : task_runner_(task_runner),
       remote_renderer_(remote_renderer.Pass()),
-      binding_(this),
       weak_factory_(this) {
   DVLOG(1) << __FUNCTION__;
 }
@@ -67,7 +66,8 @@ void MojoRendererImpl::Initialize(
     new MojoDemuxerStreamImpl(video, GetProxy(&video_stream));
 
   interfaces::RendererClientPtr client_ptr;
-  binding_.Bind(GetProxy(&client_ptr));
+  binding_.reset(
+      new mojo::Binding<RendererClient>(this, GetProxy(&client_ptr)));
   remote_renderer_->Initialize(
       client_ptr.Pass(), audio_stream.Pass(), video_stream.Pass(),
       BindToCurrentLoop(base::Bind(&MojoRendererImpl::OnInitialized,

media/mojo/services/mojo_renderer_impl.h

@@ -66,7 +66,7 @@ class MojoRendererImpl : public Renderer, public interfaces::RendererClient {
 
   DemuxerStreamProvider* demuxer_stream_provider_;
   interfaces::RendererPtr remote_renderer_;
-  mojo::Binding<RendererClient> binding_;
+  scoped_ptr<mojo::Binding<RendererClient>> binding_;
 
   // Callbacks passed to Initialize() that we forward messages from
   // |remote_renderer_| through.