Get audio_unittests passing with h/w on windows.

media/audio/win/audio_output_win_unittest.cc

Index: media/audio/win/audio_output_win_unittest.cc
diff --git a/media/audio/win/audio_output_win_unittest.cc b/media/audio/win/audio_output_win_unittest.cc
index 973df61895c08d12633d3f4108f9859400c51a2b..3ef817b5eb5a9c63f6d94005a07d3992cf8ee1a4 100644
--- a/media/audio/win/audio_output_win_unittest.cc
+++ b/media/audio/win/audio_output_win_unittest.cc
@@ -30,8 +30,6 @@ using ::testing::NiceMock;
 using ::testing::NotNull;
 using ::testing::Return;
 
-using base::win::ScopedCOMInitializer;
-
 namespace media {
 
 static const wchar_t kAudioFile1_16b_m_16K[]
@@ -422,9 +420,6 @@ TEST(WinAudioTest, PCMWaveStreamPlay200HzToneLowLatency) {
   scoped_ptr<AudioManager> audio_man(AudioManager::CreateForTesting());
   ABORT_AUDIO_TEST_IF_NOT(audio_man->HasAudioOutputDevices());
 
-  // The WASAPI API requires a correct COM environment.
-  ScopedCOMInitializer com_init(ScopedCOMInitializer::kMTA);
-
   // Use 10 ms buffer size for WASAPI and 50 ms buffer size for Wave.
   // Take the existing native sample rate into account.
   const AudioParameters params = audio_man->GetDefaultOutputStreamParameters();