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Currently only ChromeOS platform uses VideoFrameConverter. This CL
moves the related files to //media/gpu/chromeos.

BUG=chromium:1012587
TEST=gn check on kevin and eve
TEST=ninja chrome on kevin and eve
TEST=ninja media_unittests

Change-Id: I73334bec4b9eee812c3b4c88f3a0230b5a003cd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877493
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Shuo-Peng Liao <deanliao@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709394}