Update DEPS for libvpx merge.

Bug: 908827
Change-Id: Ibf23cae7e44a96753b6efc77c4d38562903c0d9f
Reviewed-on: https://chromium-review.googlesource.com/c/1357307
Reviewed-by: Michael Moss <mmoss@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#859}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
1 file changed