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This CL triggers keyword search mode when the keyword button is pressed
on the button row. The button label is taken from SelectedKeywordView,
which is refactored slightly to expose internationalized label names.
The refactor also eliminates persistent member |profile_| because it is
only used in one place where a parameter suffices.

Bug: 1046523
Change-Id: Ifb0c0d14059cfb4d866b04d2c63cb97796713024
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033907
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737933}