roll webrtc to r1008

Review URL: http://codereview.chromium.org/8689008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111553 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -33,7 +33,7 @@ vars = {
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
   "v8_revision": "10052",
-  "webrtc_revision": "946",
+  "webrtc_revision": "1008",
   "jsoncpp_revision": "246",
 }