DCHECK that audio devices are stopped prior to destruction.

media/audio/audio_output_device_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 <stdint.h>
 
 #include <vector>
 
 #include "base/at_exit.h"
 #include "base/bind_helpers.h"
@@ skipping 140 matching lines @@
   default_audio_parameters_.Reset(AudioParameters::AUDIO_PCM_LINEAR,
                                   CHANNEL_LAYOUT_STEREO, 48000, 16, 1024);
   SetDevice(kDefaultDeviceId);
 }
 
 AudioOutputDeviceTest::~AudioOutputDeviceTest() {
   audio_device_ = NULL;
 }
 
 void AudioOutputDeviceTest::CreateDevice(const std::string& device_id) {
+  // Make sure the previous device is properly cleaned up.
+  if (audio_device_)
+    StopAudioDevice();
+
   audio_output_ipc_ = new MockAudioOutputIPC();
   audio_device_ = new AudioOutputDevice(
       base::WrapUnique(audio_output_ipc_), io_loop_.task_runner(), 0, device_id,
       url::Origin(),
       base::TimeDelta::FromMilliseconds(kAuthTimeoutForTestingMs));
 }
 
 void AudioOutputDeviceTest::SetDevice(const std::string& device_id) {
   CreateDevice(device_id);
   EXPECT_CALL(*audio_output_ipc_,
@@ skipping 203 matching lines @@
   // Runs the loop and waits for |thread| to call event's closure.
   event.RunAndWait();
 
   audio_device_->Stop();
   base::RunLoop().RunUntilIdle();
 }
 
 INSTANTIATE_TEST_CASE_P(Render, AudioOutputDeviceTest, Values(false));
 
 }  // namespace media.