Get audio_unittests passing with h/w on windows.

media/audio/win/audio_low_latency_input_win_unittest.cc

Index: media/audio/win/audio_low_latency_input_win_unittest.cc
diff --git a/media/audio/win/audio_low_latency_input_win_unittest.cc b/media/audio/win/audio_low_latency_input_win_unittest.cc
index 976c462e8183949820ec3d2b8b9ea3b6c597404d..8f6b3ce2daa1f062a2e0f414ec54d4e19e123a81 100644
--- a/media/audio/win/audio_low_latency_input_win_unittest.cc
+++ b/media/audio/win/audio_low_latency_input_win_unittest.cc
@@ -22,7 +22,6 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using base::win::ScopedCOMInitializer;
 using ::testing::_;
 using ::testing::AnyNumber;
 using ::testing::AtLeast;
@@ -163,8 +162,7 @@ static bool HasCoreAudioAndInputDevices(AudioManager* audio_man) {
 class AudioInputStreamWrapper {
  public:
   explicit AudioInputStreamWrapper(AudioManager* audio_manager)
-      : com_init_(ScopedCOMInitializer::kMTA),
-        audio_man_(audio_manager),
+      : audio_man_(audio_manager),
         default_params_(
             audio_manager->GetInputStreamParameters(
                   AudioManagerBase::kDefaultDeviceId)) {
@@ -207,7 +205,6 @@ class AudioInputStreamWrapper {
     return ais;
   }
 
-  ScopedCOMInitializer com_init_;
   AudioManager* audio_man_;
   const AudioParameters default_params_;
   int frames_per_buffer_;
@@ -260,8 +257,6 @@ TEST(WinAudioInputTest, WASAPIAudioInputStreamHardwareSampleRate) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::CreateForTesting());
   ABORT_AUDIO_TEST_IF_NOT(HasCoreAudioAndInputDevices(audio_manager.get()));
 
-  ScopedCOMInitializer com_init(ScopedCOMInitializer::kMTA);
-
   // Retrieve a list of all available input devices.
   media::AudioDeviceNames device_names;
   audio_manager->GetAudioInputDeviceNames(&device_names);