Roll AppRTC c2179d16ae879f4ece..56a6925855265c45ecb

To pick up the fix which removes MediaStream.close().

Change log: https://chromium.googlesource.com/external/webrtc/apprtc/+log/c2179d16ae879f4ece..56a6925855265c45ecb

BUG=35588
TBR=kjellander@chromium.org

Review URL: https://codereview.chromium.org/1374113003 .
1 file changed