Update nss_revision to 123841 to pick up NSS 3.13.3.

Original review URL: https://chromiumcodereview.appspot.com/9474027/

R=rsleevi@chromium.org
BUG=none
TEST=no build or test failures on Mac and Windows

Review URL: http://codereview.chromium.org/9475034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124026 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -50,7 +50,7 @@ vars = {
   "v8_revision": "10840",
   "webrtc_revision": "1538",
   "jsoncpp_revision": "248",
-  "nss_revision": "122528",
+  "nss_revision": "123841",
   "rlz_revision": "66",
 }