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This reverts commit a1921808.

We postpone the VD migration at ARC++, so the mojo struct for
media::DecoderBuffer is not used now.

BUG=b:136716638
TEST=ninja chrome
TEST=./testing/xvfb.py ./out/Debug/components_unittests
     --gtest_filter=VideoAcceleratorStructTraitsTest.*

Change-Id: I783480520c82793bd41af3b904011969c37d4adb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377261Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802111}