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in BUILD.gn, we already restrict all code in media/gpu/chromeos are
only compiled when USE_V4L2_CODEC or USE_VAAPI is true. We don't need
this buildflag in the source code.

Bug: none
Test: Run video_decode_accelerator_tests on Kevin and Eve
Change-Id: I5449101ca5ae6702d10f4b3bfc233f27d2767aa7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900786Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712920}