Get audio_unittests passing with h/w on windows.

media/audio/win/core_audio_util_win_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 "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/win/scoped_co_mem.h"
 #include "base/win/scoped_com_initializer.h"
 #include "base/win/scoped_handle.h"
 #include "media/audio/audio_unittest_util.h"
 #include "media/audio/win/core_audio_util_win.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::win::ScopedCOMInitializer;
 
 namespace media {
 
 class CoreAudioUtilWinTest : public ::testing::Test {
  protected:
-  // The test runs on a COM thread in the multithreaded apartment (MTA).
+  // The tests must run on a COM thread.
   // If we don't initialize the COM library on a thread before using COM,
   // all function calls will return CO_E_NOTINITIALIZED.
-  CoreAudioUtilWinTest()
-      : com_init_(ScopedCOMInitializer::kMTA) {
+  CoreAudioUtilWinTest() {
     DCHECK(com_init_.succeeded());
   }
   ~CoreAudioUtilWinTest() override {}
 
   bool DevicesAvailable() {
-    if (!CoreAudioUtil::IsSupported())
-      return false;
-    return CoreAudioUtil::NumberOfActiveDevices(eCapture) > 0 &&
+    return CoreAudioUtil::IsSupported() &&
+           CoreAudioUtil::NumberOfActiveDevices(eCapture) > 0 &&
            CoreAudioUtil::NumberOfActiveDevices(eRender) > 0;
   }
 
   ScopedCOMInitializer com_init_;
 };
 
 TEST_F(CoreAudioUtilWinTest, NumberOfActiveDevices) {
   ABORT_AUDIO_TEST_IF_NOT(DevicesAvailable());
 
   int render_devices = CoreAudioUtil::NumberOfActiveDevices(eRender);
@@ skipping 447 matching lines @@
 }
 
 TEST_F(CoreAudioUtilWinTest, GetDefaultOutputDeviceID) {
   ABORT_AUDIO_TEST_IF_NOT(DevicesAvailable());
 
   std::string default_device_id(CoreAudioUtil::GetDefaultOutputDeviceID());
   EXPECT_FALSE(default_device_id.empty());
 }
 
 }  // namespace media