Roll in WebRTC 946 which disables most of WebRTC's trace code in Chromium builds.
The ThreadSanitizer detected data races in the code and more work will be done
to make webrtc tracing work with Chromium.

TBR=niklase
BUG=103711
Review URL: http://codereview.chromium.org/8573002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110077 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/DEPS b/DEPS
index c887fa5..a9f84ca 100644
--- a/DEPS
+++ b/DEPS
@@ -30,7 +30,7 @@
   "sfntly_revision": "98",
   "skia_revision": "2674",
   "v8_revision": "9989",
-  "webrtc_revision": "921",
+  "webrtc_revision": "946",
   "jsoncpp_revision": "246",
 }