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This CL removes the video_decode_accelerator_unittest and associated helpers.
These tests have been deprecated in favor of the video_decode_accelerator_tests
and video_decode_accelerator_perf_tests targets.

The video_decode_accelerator_unittest for the Android platform seems to use a
completely different test binary so this test has been retained.

TEST=./video_decode_accelerator_tests on eve

BUG=1802897

Change-Id: I66565844be5608f560f3a56ca72aa579c7c1c68e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851629
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708534}