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In VideoDecodePipeline, we set frame metadata POWER_EFFICIENT twice.
This CL remove the one at OnFrameDecoded().

Bug: none
Test: Play video at crosvideo.appspot.com on kevin
Change-Id: I3ef4b45e72d9d1ec52621b993cec12e7a0e65057
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1914598Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715188}