Support for shared memory via raw file descriptors was added to the video capture service for the purpose of achieving compatibility with an older version of Mojo running on ChromiumOS.

This workaround should be removed as soon as Mojo on ChromiumOS becomes compatible with the regular shared memory case.

CLs that added the workaround:
https://chromium-review.googlesource.com/c/chromium/src/+/1043646
https://chromium-review.googlesource.com/c/chromium/src/+/1053210