Update the Native Client DEPS

This enables the NaCl plugin's async message feature.

BUG=50626
TEST=nacl_ui_tests

Review URL: http://codereview.chromium.org/2825077

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55048 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -6,7 +6,7 @@ vars = {
   "skia_revision": "592",
   "chromium_git": "http://src.chromium.org/git",
   "swig_revision": "40423",
-  "nacl_revision": "2776",
+  "nacl_revision": "2886",
   "libvpx_revision": "50313",
   "libjingle_revision": "24",
 }