Updated WebRTC version to 3.46
Updated WebRTC version to 3.46

TBR=wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3539004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 5adc89747afc770e7e8b5f418e466aba5fe3dc83

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc