Update DEPS for libvpx merge.

Bug: 842265
Change-Id: Ib5478e4494ab51d8c43146276b94714f29e9db17
Reviewed-on: https://chromium-review.googlesource.com/1099764
Reviewed-by: James Zern <jzern@google.com>
Cr-Commit-Position: refs/branch-heads/3440@{#426}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
1 file changed