Revert 276680 "Roll webrtc & libjingle 6352:6406."

Broke Android bots runhooks:
http://build.chromium.org/p/chromium/builders/Android/builds/24889

> Roll webrtc & libjingle 6352:6406.
> 
> This CL is a takeover of https://codereview.chromium.org/329773004/
> 
> NOTRY=true
> 
> TBR=ronghuawu@chromium.org
> 
> Review URL: https://codereview.chromium.org/328303002

TBR=xians@chromium.org

Review URL: https://codereview.chromium.org/333693002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276693 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -54,7 +54,7 @@ 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": "6406",
+  "webrtc_revision": "6352",
   "jsoncpp_revision": "248",
   "nss_revision": "275589",
   # Three lines of non-changing comments so that