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When default search provider is disabled by the policy, user can still
press the touch bar search button to enter URL in the omnibox. Add a
text to the button for better UX.

Bug: 1011260
Change-Id: I6d35f853336c567f260579a1ee7d54e9b640a8ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891331Reviewed-by: Sidney San Martín <sdy@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711244}