iOS, AppRTCDemo: Fixes exception due to JSON for ice using "urls" instead of "url", which is introduced by r5599.
iOS, AppRTCDemo: Fixes exception due to JSON for ice using "urls" instead of "url", which is introduced by r5599.

BUG=2962
TEST=
R=fischman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/9109005

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@5610 4adac7df-926f-26a2-2b94-8c16560cd09d

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