Remove deprecated media switches.

media/audio/audio_manager_base.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 "media/audio/audio_manager_base.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 71 matching lines @@
           ObserverList<AudioDeviceListener>::NOTIFY_EXISTING_ONLY),
       audio_thread_("AudioThread"),
       audio_log_factory_(audio_log_factory) {
 #if defined(OS_WIN)
   audio_thread_.init_com_with_mta(true);
 #elif defined(OS_MACOSX)
   // CoreAudio calls must occur on the main thread of the process, which in our
   // case is sadly the browser UI thread.  Failure to execute calls on the right
   // thread leads to crashes and odd behavior.  See http://crbug.com/158170.
   // TODO(dalecurtis): We should require the message loop to be passed in.
-  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
-  if (!cmd_line->HasSwitch(switches::kDisableMainThreadAudio) &&
-      base::MessageLoopProxy::current().get() &&
-      base::MessageLoopForUI::IsCurrent()) {
+  if (base::MessageLoopForUI::IsCurrent()) {
     task_runner_ = base::MessageLoopProxy::current();
     return;
   }
 #endif
 
   CHECK(audio_thread_.Start());
   task_runner_ = audio_thread_.message_loop_proxy();
 }
 
 AudioManagerBase::~AudioManagerBase() {
@@ skipping 331 matching lines @@
     (*it)->dispatcher->CloseStreamsForWedgeFix();
   }
   for (AudioOutputDispatchers::iterator it = output_dispatchers_.begin();
        it != output_dispatchers_.end(); ++it) {
     (*it)->dispatcher->RestartStreamsForWedgeFix();
   }
 #endif
 }
 
 }  // namespace media