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This reverts commit 44326d9d.

Reason for revert: Suspect in https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/8371
Deterministic failure: TabSearchAppTest.All (status FAILURE)

Original change's description:
> Tab Search: Add last_active_time_ticks to tab_search.mojom.Tab
> 
> last_active_time_ticks is used to sort recent tabs.
> 
> Bug: 1099917
> Change-Id: If5c224729e39c20ceda48a3d81b6e171b92be731
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382655
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
> Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#805629}

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

Change-Id: I9f1122dbb9cd1c6ecda5751744fceaaea742905c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1099917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402938Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805654}