Handle audio device changes on Mac (Take 2).

media/audio/mac/audio_low_latency_output_mac.cc

Index: media/audio/mac/audio_low_latency_output_mac.cc
diff --git a/media/audio/mac/audio_low_latency_output_mac.cc b/media/audio/mac/audio_low_latency_output_mac.cc
index ebf33e56ff41ae227a872953e60fa9992d7a0a76..cbef797d1926d79fbfef39b4c99cf4e735dd9d37 100644
--- a/media/audio/mac/audio_low_latency_output_mac.cc
+++ b/media/audio/mac/audio_low_latency_output_mac.cc
@@ -117,18 +117,18 @@ bool AUAudioOutputStream::Open() {
     return false;
 
   // Open and initialize the DefaultOutputUnit.
-  Component comp;
-  ComponentDescription desc;
+  AudioComponent comp;

[scherkus (not reviewing), 2012/10/31 23:17:22]

what's up w/ the change here?

[DaleCurtis, 2012/11/01 00:16:33]

Taken from sail's original patch set, I was hoping he or crogers could provide
some additional context.

+  AudioComponentDescription desc;
 
   desc.componentType = kAudioUnitType_Output;
   desc.componentSubType = kAudioUnitSubType_DefaultOutput;
   desc.componentManufacturer = kAudioUnitManufacturer_Apple;
   desc.componentFlags = 0;
   desc.componentFlagsMask = 0;
-  comp = FindNextComponent(0, &desc);
+  comp = AudioComponentFindNext(0, &desc);
   DCHECK(comp);
 
-  result = OpenAComponent(comp, &output_unit_);
+  result = AudioComponentInstanceNew(comp, &output_unit_);
   OSSTATUS_DCHECK(result == noErr, result);
   if (result)
     return false;
@@ -193,7 +193,7 @@ bool AUAudioOutputStream::Configure() {
 
 void AUAudioOutputStream::Close() {
   if (output_unit_)
-    CloseComponent(output_unit_);
+    AudioComponentInstanceDispose(output_unit_);
 
   // Inform the audio manager that we have been closed. This can cause our
   // destruction.