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Leaves the command line flag for use in browsertesting and in the
about:flag.

Note: The browser tests can't set features with params because of this:
http://shortn/_ZytN1SHiqN

Bug: 1082505
Change-Id: I474fe012c6a00b15f38d70334d677a29815b24b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2265178Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782107}