Replace AudioManager::Init() with InitializeOnAudioThread().

media/audio/linux/audio_manager_linux.cc

Index: media/audio/linux/audio_manager_linux.cc
diff --git a/media/audio/linux/audio_manager_linux.cc b/media/audio/linux/audio_manager_linux.cc
index 5f318622b2f77322855a49b955fe14e97c2e3b12..b9d7aeb5131b08dd3329ab81b9af275651e80af9 100644
--- a/media/audio/linux/audio_manager_linux.cc
+++ b/media/audio/linux/audio_manager_linux.cc
@@ -59,7 +59,8 @@ bool AudioManagerLinux::HasAudioInputDevices() {
   return HasAnyAlsaAudioDevice(kStreamCapture);
 }
 
-AudioManagerLinux::AudioManagerLinux() {
+AudioManagerLinux::AudioManagerLinux()
+    : wrapper_(new AlsaWrapper()) {
   SetMaxOutputStreamsAllowed(kMaxOutputStreams);
 }
 
@@ -67,11 +68,6 @@ AudioManagerLinux::~AudioManagerLinux() {
   Shutdown();
 }
 
-void AudioManagerLinux::Init() {
-  AudioManagerBase::Init();
-  wrapper_.reset(new AlsaWrapper());
-}
-
 bool AudioManagerLinux::CanShowAudioInputSettings() {
   scoped_ptr<base::Environment> env(base::Environment::Create());