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This is a reland of 0d88901a


Diff against patchset 1 for reland diff.

Added call to close widget and assert that the button is no
longer tracking.

Original change's description:
> Tab Search: Update TabSearchButton tests
>
> This CL creates a new file for TabSearchButton browser tests. These
> tests run for both the fixed and regular entrypoints.
>
> Existing tests for the TabSearchButton have been moved from the tab
> strip into the TabSearchButton browser tests.
>
> Bug: 1099917
> Change-Id: I0b1d57826768705316b9bed814dac7af96ce52e8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422730
> Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#809376}

Bug: 1099917
Change-Id: I327e68cebff1d62c9be75c971e28580b1e2dd789
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425394
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809995}