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We're about to launch the fullscreen exit UI, starting at 100% for Dev and
Canary. Currently the flag for fullscreen exit UI is implemented as a
command line switch, which can't be used with Finch experiment. This CL
makes the flag base::Feature so that it can be controlled by experiment.

Bug: 829606
Change-Id: I955439a4cf6cdd6196fa6d9d42faaebabbc373b0
Reviewed-on: https://chromium-review.googlesource.com/1008724
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550086}