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This fixes an issue where Chrome will only download a video/3gpp file
instead of playing it when opened with Chrome.

Bug: 910658, 923081
Change-Id: I0fcdfe5952f0020c35fe09a0db85a4e83fe4d37a
Reviewed-on: https://chromium-review.googlesource.com/c/1437720Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626310}