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This is now in a good enough shape to turn on. The remaining work is to
add tracking to ensure that we open the most-recently-used profile on
launch.

Bug: 982024
Change-Id: Ib6b922a1ebca043a6c8f8eb2ded2cd3c837cc80d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1902866
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713659}