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kLiveCaptionSystemWideOnChromeOS.

Introduce a new media switch for the M2 launch of Live Caption.
In that launch, Live Caption will run system-wide on ChromeOS, as
opposed to just in the browser.

Bug: 1055150
Change-Id: I79176e94201edffe541db266422c79e4c264feff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2619943Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#842208}