Have Opus follow Chromium revisions
Have Opus follow Chromium revisions

Before this change, a pinned version of Opus was used in WebRTC. This could lead to WebRTC running a different version of Opus compared to the version used with the corresponding Chromium revision.
This CL pulls in the Opus version the Chromium uses.

BUG=3546
R=kjellander@webrtc.org, niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/15979005

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@6602 4adac7df-926f-26a2-2b94-8c16560cd09d

mwgoldsmith/libilbc,mwgoldsmith/ilbc,TimothyGu/libilbc,TimothyGu/libilbc,mwgoldsmith/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,mwgoldsmith/ilbc,mwgoldsmith/libilbc,mwgoldsmith/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,mwgoldsmith/ilbc,mwgoldsmith/ilbc,ShiftMediaProject/libilbc