Remove use of deprecated MessageLoop methods in cc.

cc/trees/layer_tree_host_unittest_copyrequest.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 <stddef.h>
 
+#include "base/location.h"
 #include "base/memory/ptr_util.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "cc/layers/layer_iterator.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/fake_picture_layer.h"
 #include "cc/test/layer_tree_test.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "gpu/GLES2/gl2extchromium.h"
 
@@ skipping 22 matching lines @@
     layer_tree_host()->SetRootLayer(root);
     LayerTreeHostCopyRequestTest::SetupTree();
     client_.set_bounds(root->bounds());
   }
 
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void DidCommit() override { WaitForCallback(); }
 
   void WaitForCallback() {
-    base::MessageLoop::current()->PostTask(
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(&LayerTreeHostCopyRequestTestMultipleRequests::NextStep,
                    base::Unretained(this)));
   }
 
   void NextStep() {
     int frame = layer_tree_host()->source_frame_number();
     switch (frame) {
       case 1:
         child->RequestCopyOfOutput(CopyOutputRequest::CreateBitmapRequest(
@@ skipping 1203 matching lines @@
   int num_draws_;
   bool copy_happened_;
   bool draw_happened_;
 };
 
 SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
     LayerTreeHostCopyRequestTestMultipleDrawsHiddenCopyRequest);
 
 }  // namespace
 }  // namespace cc