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CreatePlatformVideoFrame in video_frame_helpers.h almost delegates
CreatePlatformVideoFrame in media/gpu/linux/platform_video_frame_utils.h.
We remove the function in media/gpu/test to reduce the code size

Bug: None
Test: video_decode_accelerator_unittest w/wo video_frame_validator
Test: video_decode_accelerator_tests w/wo video_frame_validator
Change-Id: Ice7ed5b099104d613456692c43ae8df65e67a5cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1563531Reviewed-by: David Staessens <dstaessens@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649791}