Bug 1398659. P8 - remove the call to mCacheStream.NotifyDataLength() from OpenChannel(). r=gerald

MediaCacheStream::mStreamLength has been set either in Init() or InitAsClone().

MozReview-Commit-ID: L259ecDgjN7

--HG--
extra : rebase_source : 7df74d388808492faac73c3e41a972cb22cdb187
extra : intermediate-source : d834e02c15ed9361a02977349459fad079910642
extra : source : 45df347e1fd6b67d60212f2d87312d597656a7d6

dom/media/MediaResource.cpp

@@ -549,18 +549,6 @@ ChannelMediaResource::OpenChannel()
   MOZ_ASSERT(mChannel);
   MOZ_ASSERT(!mListener, "Listener should have been removed by now");
 
-  // Set the content length, if it's available as an HTTP header.
-  // This ensures that MediaResource wrapping objects for platform libraries
-  // that expect to know the length of a resource can get it before
-  // OnStartRequest() fires.
-  nsCOMPtr<nsIHttpChannel> hc = do_QueryInterface(mChannel);
-  if (hc && !IsPayloadCompressed(hc)) {
-    int64_t cl = -1;
-    if (NS_SUCCEEDED(hc->GetContentLength(&cl)) && cl != -1) {
-      mCacheStream.NotifyDataLength(cl);
-    }
-  }
-
   mListener = new Listener(this);
   nsresult rv = mChannel->SetNotificationCallbacks(mListener.get());
   NS_ENSURE_SUCCESS(rv, rv);