Revert 266242 "Roll webrtc 5963 -> 5979"

> Roll webrtc 5963 -> 5979
> 
> R=ronghuawu@chromium.org
> 
> Review URL: https://codereview.chromium.org/256633003

TBR=wjia@chromium.org

Review URL: https://codereview.chromium.org/252753005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266366 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -55,7 +55,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.
-  "webrtc_revision": "5979",
+  "webrtc_revision": "5963",
   "jsoncpp_revision": "248",
   "nss_revision": "265958",
   # Three lines of non-changing comments so that

third_party/libjingle/README.chromium

 Name: libjingle
 URL: http://code.google.com/p/webrtc/
 Version: unknown
-Revision: 5979
+Revision: 5963
 License: BSD
 License File: source/talk/COPYING
 Security Critical: yes