Roll DEPS to get OpenMAX DL version that supports clang's assembler.

See https://webrtc-codereview.appspot.com/13059004/ for the relevant change (and revision number).

BUG=397313
NOTRY=true

Review URL: https://codereview.chromium.org/415363002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285484 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -81,7 +81,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling openmax_dl
   # and whatever else without interference from each other.
-  "openmax_dl_revision": "6483",
+  "openmax_dl_revision": "6777",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.