scheduler: Return a base::SingleThreadTaskRunner for the default task runner.

content/test/fake_renderer_scheduler.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 "content/test/fake_renderer_scheduler.h"
 
 #include "third_party/WebKit/public/platform/WebThread.h"
 
 namespace content {
 
 FakeRendererScheduler::FakeRendererScheduler() {
 }
 
 FakeRendererScheduler::~FakeRendererScheduler() {
 }
 
 scoped_ptr<blink::WebThread> FakeRendererScheduler::CreateMainThread() {
   return nullptr;
 }
 
-scoped_refptr<scheduler::TaskQueue> FakeRendererScheduler::DefaultTaskRunner() {
+scoped_refptr<base::SingleThreadTaskRunner>
+FakeRendererScheduler::DefaultTaskRunner() {
   return nullptr;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 FakeRendererScheduler::CompositorTaskRunner() {
   return nullptr;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 FakeRendererScheduler::LoadingTaskRunner() {
@@ skipping 94 matching lines @@
 
 double FakeRendererScheduler::CurrentTimeSeconds() const {
   return 0.0;
 }
 
 double FakeRendererScheduler::MonotonicallyIncreasingTimeSeconds() const {
   return 0.0;
 }
 
 }  // namespace content