Enable pulse as the default IO handling in Chrome

media/base/media_switches.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/base/media_switches.h"
 
 namespace switches {
 
 // Allow users to specify a custom buffer size for debugging purpose.
 const char kAudioBufferSize[] = "audio-buffer-size";
 
 #if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_SOLARIS)
 // The Alsa device to use when opening an audio stream.
 const char kAlsaOutputDevice[] = "alsa-output-device";
 // The Alsa device to use when opening an audio input stream.
 const char kAlsaInputDevice[] = "alsa-input-device";
 #endif
 
 #if defined(USE_CRAS)
 // Use CRAS, the ChromeOS audio server.
 const char kUseCras[] = "use-cras";
 #endif
 
-#if defined(USE_PULSEAUDIO)
-// Use PulseAudio on platforms that support it.
-const char kUsePulseAudio[] = "use-pulseaudio";
-#endif
-
 #if defined(OS_WIN)
 // Use exclusive mode audio streaming for Windows Vista and higher.
 // Leads to lower latencies for audio streams which uses the
 // AudioParameters::AUDIO_PCM_LOW_LATENCY audio path.
 // See http://msdn.microsoft.com/en-us/library/windows/desktop/dd370844(v=vs.85).aspx
 // for details.
 const char kEnableExclusiveAudio[] = "enable-exclusive-audio";
 #endif
 
 // Disable automatic fallback from low latency to high latency path.
@@ skipping 18 matching lines @@
 const char kEnableOpusPlayback[] = "enable-opus-playback";
 
 // Enables VP9 playback in media elements.
 const char kEnableVp9Playback[] = "enable-vp9-playback";
 
 #if defined(OS_WIN)
 const char kWaveOutBuffers[] = "waveout-buffers";
 #endif
 
 }  // namespace switches