Remove ENABLE(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 114 matching lines @@
   // TODO(aa): Need to figure out how shutdown works.
 }
 
 void DocumentView::Load(mojo::URLResponsePtr response) {
   web_view_ = blink::WebView::create(this);
   ConfigureSettings(web_view_->settings());
   web_view_->setMainFrame(blink::WebLocalFrame::create(this));
   web_view_->mainFrame()->load(GURL(response->url), response->body.Pass());
 }
 
-blink::WebLayerTreeView* DocumentView::initializeLayerTreeView() {
+void DocumentView::initializeLayerTreeView() {
   layer_host_.reset(new LayerHost(this));
   root_layer_ = make_scoped_refptr(new Layer(this));
   layer_host_->SetRootLayer(root_layer_);
-  return nullptr;
 }
 
 mojo::Shell* DocumentView::GetShell() {
   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;
@@ skipping 129 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