Cherry pick [Android WebView] Disable WebRTC.

Cherry pick of https://codereview.chromium.org/25453008/

Bug: 7882891

Original Description:
[Android WebView] Disable WebRTC.

Android WebView compiles out WebRTC, so we should disable runtime
interfaces too.

Change-Id: I72da32a95af8feb395a144a64a267061a6179fd0
1 file changed