iOS AppRTCMobile: Enable H264 High profile
iOS AppRTCMobile: Enable H264 High profile

BUG=webrtc:6337

Review-Url: https://codereview.webrtc.org/2662553002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#16321}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 986012d346ef0df64fbc9a2a1b325b8263944544

Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk