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The dependent CL adds an entrypoint for Tab Search in the tab strip.
As a result the current toolbar button entrypoint is no longer
necessary.

Bug: 1099917
Change-Id: I68a0fdbb4bf1bbc08e65f048c132593fa5229d3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341942Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795974}