Adding SCTP based data channels to the existing webrtc content_browser tests.

R=phoglund@chromium.org, wjia@chromium.org

Review URL: https://codereview.chromium.org/23875039

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229001 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229001