Switch audio synchronization from sleep() based to select() based.

media/audio/audio_input_device.cc

Index: media/audio/audio_input_device.cc
diff --git a/media/audio/audio_input_device.cc b/media/audio/audio_input_device.cc
index d7685840ecf0320dea700ac0e7945115840cc571..d1a6ab89f9f431bdd0d82b91a4a02497e590f9b0 100644
--- a/media/audio/audio_input_device.cc
+++ b/media/audio/audio_input_device.cc
@@ -138,10 +138,10 @@ void AudioInputDevice::OnStreamCreated(
     return;
 
   DCHECK(audio_thread_.IsStopped());
-  audio_callback_.reset(
-      new AudioInputDevice::AudioThreadCallback(
-          audio_parameters_, handle, length, total_segments, callback_));
-  audio_thread_.Start(audio_callback_.get(), socket_handle, "AudioInputDevice");
+  audio_callback_.reset(new AudioInputDevice::AudioThreadCallback(
+      audio_parameters_, handle, length, total_segments, callback_));
+  audio_thread_.Start(
+      audio_callback_.get(), socket_handle, "AudioInputDevice", false);
 
   state_ = RECORDING;
   ipc_->RecordStream();