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It currently takes an OmniboxFocusState, but only two states are ever
used. Change it to a bool to remove the possibility of the renderer
sending an invalid state.

Change-Id: Ib1bc4bb5bd3415bbaf4de96d63b81fd8cfa89907
Reviewed-on: https://chromium-review.googlesource.com/1217168Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590154}