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We have GenMD5 only in order to obtain md5 values of decoded frames for a new
stream. ffmpeg has an option to generate md5 of each frame. We should remove
the test case in favor of ffmpeg.

Bug: None
Test: Build vda unittest and vda tests
Test: Confirm the current md5 values match the outputs of "ffmpeg -f framemd5"
Change-Id: I70ae409974e127a0fd54267baad57a1b9c0bb4a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1547485Reviewed-by: David Staessens <dstaessens@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646687}