Get audio_unittests passing with h/w on windows.

media/audio/audio_input_volume_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 <cmath>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_manager_base.h"
@@ skipping 20 matching lines @@
 
     // Sleep 100ms to wait for the operation.
     base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(100));
   }
 
   return volume;
 }
 
 class AudioInputVolumeTest : public ::testing::Test {
  protected:
-  AudioInputVolumeTest()
-      : audio_manager_(AudioManager::CreateForTesting())
-#if defined(OS_WIN)
-       , com_init_(base::win::ScopedCOMInitializer::kMTA)
-#endif
-  {
-  }
+  AudioInputVolumeTest() : audio_manager_(AudioManager::CreateForTesting()) {}
 
   bool HasCoreAudioAndInputDevices() {
 #if defined(OS_WIN)
     // TODO(henrika): add support for volume control on Windows XP as well.
     if (!CoreAudioUtil::IsSupported())
       return false;
 #endif
     return audio_manager_->HasAudioInputDevices();
   }
 
@@ skipping 22 matching lines @@
       ais = NULL;
     }
 #elif defined(OS_WIN) || defined(OS_MACOSX)
     EXPECT_TRUE(ais->Open());
 #endif
 
     return ais;
   }
 
   scoped_ptr<AudioManager> audio_manager_;
-
-#if defined(OS_WIN)
-  base::win::ScopedCOMInitializer com_init_;
-#endif
 };
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 // Currently failing on linux ARM bot: http://crbug/238490
 // Also flaky on x86_64: http://crbug/236936
 #define MAYBE_InputVolumeTest DISABLED_InputVolumeTest
 #else
 #define MAYBE_InputVolumeTest InputVolumeTest
 #endif
 
@@ skipping 67 matching lines @@
     // Restores the volume to the original value.
     ais->SetVolume(original_volume);
     current_volume = ais->GetVolume();
     EXPECT_EQ(original_volume, current_volume);
 
     ais->Close();
   }
 }
 
 }  // namespace media