Enable more WebRtc content_browsertests on Android.

BUG=181069
R=ronghuawu@chromium.org

Review URL: https://codereview.chromium.org/183893025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255152 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255152