Change default audio device from "plug:default" to "default".

media/audio/linux/alsa_output.cc

 // Copyright (c) 2009 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.
 //
 // The audio stream implementation is made difficult because different methods
 // are available for calling depending on what state the stream is.  Here is the
 // state transition table for the stream.
 //
 // STATE_CREATED -> Open() -> STATE_OPENED
 // STATE_OPENED -> Start() -> STATE_STARTED
@@ skipping 51 matching lines @@
 // value would be.
 static const unsigned int kTargetLatencyMicroseconds = 10000;
 
 // Minimal amount of time to sleep.  If any future event is expected to
 // execute within this timeframe, treat it as if it should execute immediately.
 //
 // TODO(ajwong): Determine if there is a sensible minimum sleep resolution and
 // adjust accordingly.
 static const int64 kMinSleepMilliseconds = 10L;
 
-const char* AlsaPCMOutputStream::kDefaultDevice = "plug:default";
+const char* AlsaPCMOutputStream::kDefaultDevice = "default";
 
 AlsaPCMOutputStream::AlsaPCMOutputStream(const std::string& device_name,
                                          int min_buffer_ms,
                                          AudioManager::Format format,
                                          int channels,
                                          int sample_rate,
                                          char bits_per_sample)
     : state_(STATE_CREATED),
       device_name_(device_name),
       playback_handle_(NULL),
@@ skipping 429 matching lines @@
   NOTIMPLEMENTED();
 }
 
 void AlsaPCMOutputStream::GetVolume(double* left_level, double* right_level) {
   NOTIMPLEMENTED();
 }
 
 size_t AlsaPCMOutputStream::GetNumBuffers() {
   return 0;
 }