Bug 1247056 - Report specific cubeb-init error code - r=jwwang

MozReview-Commit-ID: AqR2jKKtNHL

--HG--
extra : histedit_source : a2789615fa45e191e04657e57f571362d86daf76

dom/media/AudioStream.cpp

@@ -351,7 +351,7 @@ AudioStream::Init(uint32_t aNumChannels, uint32_t aRate,
   if (!cubebContext) {
     NS_WARNING("Can't get cubeb context!");
     CubebUtils::ReportCubebStreamInitFailure(true);
-    return NS_ERROR_FAILURE;
+    return NS_ERROR_DOM_MEDIA_CUBEB_INITIALIZATION_ERR;
   }
 
   return OpenCubeb(cubebContext, params, startTime, CubebUtils::GetFirstStream());