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These cases were commented out (VPX used to not work). They should now match the GYP build. I think these deps aren't strictly necessary because dependent targets link vpx in, but it's a good idea to match GYP, and I think this will make the header checker happier.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/610703002

Cr-Commit-Position: refs/heads/master@{#297039}