Bug 1315521 - remove CC for audio channel agent. r=jwwang

Because audio channel agent uses weak ref to HTMLMediaElement, so we don't need to add it into the CC list.

MozReview-Commit-ID: 4cFfDUlbMFB

--HG--
extra : rebase_source : 4d595397d11e2e3c46cce17df148bea8f77f92e8

dom/html/HTMLMediaElement.cpp

@@ -703,7 +703,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLMediaElement, nsGenericHTM
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSourcePointer)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoadBlockedDoc)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSourceLoadCandidate)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAudioChannelAgent)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mError)
   for (uint32_t i = 0; i < tmp->mOutputStreams.Length(); ++i) {
     NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOutputStreams[i].mStream);
@@ -728,7 +727,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLMediaElement, nsGenericHTMLE
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mSourcePointer)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mLoadBlockedDoc)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mSourceLoadCandidate)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mAudioChannelAgent)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mError)
   for (uint32_t i = 0; i < tmp->mOutputStreams.Length(); ++i) {
     NS_IMPL_CYCLE_COLLECTION_UNLINK(mOutputStreams[i].mStream)