Revert of Move content's shell connections to the IO thread

content/browser/renderer_host/render_widget_host_view_mus.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/renderer_host/render_widget_host_view_mus.h"
 
 #include <utility>
 
 #include "build/build_config.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
@@ skipping 25 matching lines @@
   window->SetVisible(true);
   window->SetBounds(gfx::Rect(300, 300));
   window->set_input_event_handler(this);
   parent_window->AddChild(window);
   mus_window_.reset(new ui::ScopedWindowPtr(window));
   host_->SetView(this);
 
   // Connect to the renderer, pass it a WindowTreeClient interface request
   // and embed that client inside our mus window.
   mojom::RenderWidgetWindowTreeClientFactoryPtr factory;
-  host_->GetProcess()->GetRemoteInterfaces()->GetInterface(&factory);
+  host_->GetProcess()->GetChildConnection()->GetInterface(&factory);
 
   ui::mojom::WindowTreeClientPtr window_tree_client;
   factory->CreateWindowTreeClientForRenderWidget(
       host_->GetRoutingID(), mojo::GetProxy(&window_tree_client));
   mus_window_->window()->Embed(std::move(window_tree_client),
                                ui::mojom::kEmbedFlagEmbedderInterceptsEvents);
 }
 
 RenderWidgetHostViewMus::~RenderWidgetHostViewMus() {}
 
@@ skipping 248 matching lines @@
 
 void RenderWidgetHostViewMus::OnWindowInputEvent(
     ui::Window* window,
     const ui::Event& event,
     std::unique_ptr<base::Callback<void(ui::mojom::EventResult)>>*
         ack_callback) {
   // TODO(sad): Dispatch |event| to the RenderWidgetHost.
 }
 
 }  // namespace content