Replace WaitableEvents and ConditionalVariables in VideoRendererBase tests with MessageLoop.

media/base/mock_callback.cc

-// Copyright (c) 2012 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 "media/base/mock_callback.h"
-
-#include "base/bind.h"
-
-using ::testing::_;
-using ::testing::StrictMock;
-
-namespace media {
-
-MockClosure::MockClosure() {}
-MockClosure::~MockClosure() {}
-
-base::Closure NewExpectedClosure() {
-  StrictMock<MockClosure>* callback = new StrictMock<MockClosure>();
-  EXPECT_CALL(*callback, Run());
-  return base::Bind(&MockClosure::Run, callback);
-}
-
-class MockStatusCB : public base::RefCountedThreadSafe<MockStatusCB> {
- public:
-  MockStatusCB() {}
-  MOCK_METHOD1(Run, void(PipelineStatus));
-
- protected:
-  friend class base::RefCountedThreadSafe<MockStatusCB>;
-  virtual ~MockStatusCB() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MockStatusCB);
-};
-
-base::Callback<void(PipelineStatus)> NewExpectedStatusCB(
-    PipelineStatus status) {
-  StrictMock<MockStatusCB>* callback = new StrictMock<MockStatusCB>();
-  EXPECT_CALL(*callback, Run(status));
-  return base::Bind(&MockStatusCB::Run, callback);
-}
-
-}  // namespace media