Remove synchronous compositeAndReadback() from WebLayerTreeView impls.

content/test/web_layer_tree_view_impl_for_testing.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/test/web_layer_tree_view_impl_for_testing.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/lock.h"
 #include "cc/base/switches.h"
@@ skipping 104 matching lines @@
 void WebLayerTreeViewImplForTesting::setNeedsAnimate() {
   layer_tree_host_->SetNeedsAnimate();
 }
 
 bool WebLayerTreeViewImplForTesting::commitRequested() const {
   return layer_tree_host_->CommitRequested();
 }
 
 void WebLayerTreeViewImplForTesting::didStopFlinging() {}
 
-bool WebLayerTreeViewImplForTesting::compositeAndReadback(
-    void* pixels, const WebRect& rect_in_device_viewport) {
-  return layer_tree_host_->CompositeAndReadback(pixels,
-                                                rect_in_device_viewport);
-}
-
 void WebLayerTreeViewImplForTesting::finishAllRendering() {
   layer_tree_host_->FinishAllRendering();
 }
 
 void WebLayerTreeViewImplForTesting::setDeferCommits(bool defer_commits) {
   layer_tree_host_->SetDeferCommits(defer_commits);
 }
 
 void WebLayerTreeViewImplForTesting::Layout() {
 }
@@ skipping 22 matching lines @@
           : NULL);
 }
 
 void WebLayerTreeViewImplForTesting::clearViewportLayers() {
   layer_tree_host_->RegisterViewportLayers(scoped_refptr<cc::Layer>(),
                                            scoped_refptr<cc::Layer>(),
                                            scoped_refptr<cc::Layer>());
 }
 
 }  // namespace content