Stop chrome from initializing ozone inside mash.
Stop chrome from initializing ozone inside mash.

The chrome UI process normally initializes ozone. When running inside
mash the mus prcoess owns ozone instead. Add a check for a flag that
signals chrome is running inside mash and don't initialize ozone in that
case.

BUG=592756

Review URL: https://codereview.chromium.org/1825733003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#382894}

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