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As suggested in http://crbug.com/990381, it should be beneficial to
change the child process flag for the video capture service on MacOS.
This is due to issues with entitlements.

This CL changes the flag of the utility process to CHILD_PLUGIN.

Bug: 990381
Change-Id: I31583c2860678d0fadee00f37cb1cfd089ce53a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1905848Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Armando Miraglia <armax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715283}