Enable the Sky compositor

sky/viewer/document_view.cc

 // Copyright 2014 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 "sky/viewer/document_view.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 153 matching lines @@
   web_layer_tree_view_impl_.reset(new WebLayerTreeViewImpl(
       compositor_thread_, surfaces_service.Pass(), gpu_service.Pass()));
 
   return web_layer_tree_view_impl_.get();
 #endif
 }
 
 #if ENABLE_SKY_COMPOSITOR
 
 mojo::Shell* DocumentView::GetShell() {
-  return shell_.get();
+  return shell_;
 }
 
 void DocumentView::BeginFrame(base::TimeTicks frame_time) {
   double frame_time_sec = (frame_time - base::TimeTicks()).InSecondsF();
   double deadline_sec = frame_time_sec;
   double interval_sec = 1.0/60;
   blink::WebBeginFrameArgs web_begin_frame_args(
       frame_time_sec, deadline_sec, interval_sec);
   web_view_->beginFrame(web_begin_frame_args);
   web_view_->layout();
@@ skipping 136 matching lines @@
 void DocumentView::StartDebuggerInspectorBackend() {
   if (!inspector_backend_) {
     inspector_host_.reset(new InspectorHostImpl(web_view_, shell_));
     inspector_backend_.reset(
         new inspector::InspectorBackendMojo(inspector_host_.get()));
   }
   inspector_backend_->Connect();
 }
 
 }  // namespace sky