Replace WaitableEvents and ConditionalVariables in VideoRendererBase tests with MessageLoop.

media/filters/ffmpeg_audio_decoder_unittest.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 <deque>
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/stringprintf.h"
 #include "media/base/decoder_buffer.h"
-#include "media/base/mock_callback.h"
 #include "media/base/mock_filters.h"
 #include "media/base/test_data_util.h"
+#include "media/base/test_helpers.h"
 #include "media/ffmpeg/ffmpeg_common.h"
 #include "media/filters/ffmpeg_audio_decoder.h"
 #include "media/filters/ffmpeg_glue.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
 using ::testing::ReturnRef;
 using ::testing::StrictMock;
 
 namespace media {
@@ skipping 145 matching lines @@
 
   EXPECT_CALL(*demuxer_, Read(_))
       .WillOnce(InvokeReadPacket(this));
   Read();
 
   EXPECT_EQ(decoded_audio_.size(), 1u);
   EXPECT_TRUE(decoded_audio_[0].get() ==  NULL);
 }
 
 }  // namespace media