Cleanup AudioDeviceThread to avoid accidental misuse.

content/browser/audio_device_thread.cc

Index: content/browser/audio_device_thread.cc
diff --git a/content/browser/audio_device_thread.cc b/content/browser/audio_device_thread.cc
deleted file mode 100644
index 21cceb5d99f3fb28b8b08568922ec5a3e55f312e..0000000000000000000000000000000000000000
--- a/content/browser/audio_device_thread.cc
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright 2016 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/threading/thread_task_runner_handle.h"
-#include "build/build_config.h"
-#include "content/browser/audio_device_thread.h"
-
-namespace content {
-
-scoped_refptr<base::SingleThreadTaskRunner> AudioDeviceThread::GetTaskRunner() {
-#if defined(OS_MACOSX)
-    // On Mac audio task runner must belong to the main thread.
-    // See http://crbug.com/158170.
-    return base::ThreadTaskRunnerHandle::Get();
-#else
-    return thread_.task_runner();
-#endif  // defined(OS_MACOSX)
-  }
-
-AudioDeviceThread::AudioDeviceThread() : thread_("AudioThread") {
-#if defined(OS_WIN)
-  thread_.init_com_with_mta(true);
-#endif
-  CHECK(thread_.Start());
-}
-
-}  // namespace content