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This reverts commit ad602416.

Reason for revert: Compile breaks: https://ci.chromium.org/p/chromium/builders/ci/ChromiumOS%20ASAN%20Release/104250

Original change's description:
> media/gpu/BUILD.gn: restrict image_processor, video_frame_mapper to CrOs, Chromecast
> 
> This CL restricts //media/gpu:image_processor and :video_frame_mapper
> to ChromeOS and ChromeCast, since they are only implemented for these
> platforms.  Same for image_processor_test.
> 
> video_frame_file_writer.cc sandwiched some uses of |video_frame_mapper_|
> in an OS_LINUX and left others unprotected, which confused OS_WIN
> builds. This CL changes those to if defined(OS_CHROMEOS), since I
> don't think this file is meant to be compiled nor run on OS_LINUX.
> 
> Change-Id: I8098d55859c50a752b40a63955684e558db3582a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787467
> Commit-Queue: Miguel Casas <mcasas@chromium.org>
> Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
> Reviewed-by: Yuchen Liu <yucliu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#698566}

TBR=deanliao@chromium.org,mcasas@chromium.org,akahuang@chromium.org,hiroh@chromium.org,acourbot@chromium.org,yucliu@chromium.org,dstaessens@chromium.org

Change-Id: I1f70a99e52b6ca640e4f8c9fcc79ba71dbb7f5f0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816972Reviewed-by: Nate Chapin <japhet@chromium.org>
Commit-Queue: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698595}