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This reverts commit 683608bf.

Reason for revert: The newly added test UNSCHEDULED_tab_search keeps failing the build: https://ci.chromium.org/p/chrome/builders/ci/chromeos-eve-chrome
Please take a look and help fixing.

Original change's description:
> Tab Search: Implement performance benchmark
>
> Doc:
> https://docs.google.com/document/d/1-1ijT7wt05hlBZmSKjX_DaTCzVqpxbfTM1y-j7kYHlc
> Usage:
> tools/perf/run_benchmark run UNSCHEDULED_tab_search --browser-executable=out/Default/chrome --story-filter=tab_search:top10:2020
> tools/perf/run_benchmark run UNSCHEDULED_tab_search --browser-executable=out/Default/chrome --story-filter=tab_search:top50:2020
> tools/perf/run_benchmark run UNSCHEDULED_tab_search --browser-executable=out/Default/chrome --story-filter=tab_search:top100:2020
>
> Change-Id: I684024f9cf3264ac2ed4feca15c6059342a493c2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461224
> Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
> Reviewed-by: John Chen <johnchen@chromium.org>
> Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#824599}

TBR=johnchen@chromium.org,tluk@chromium.org,yuhengh@chromium.org

Change-Id: If919a1e96f43a661f72e3f33f59f590922790644
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
bug: 1146335
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523416Reviewed-by: Tina Wang <tinazwang@chromium.org>
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825025}