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This reverts commit 315b3895.

Reason for revert: new tests fail on linux-chromeos-rel: https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-rel/30281

Original change's description:
> In tablet mode, tap on overview background should go to home screen.
> 
> Clamshell mode behavior will remain the same, i.e., tapping on the
> overview background will return to its previous state, it can either be
> in-app or home screen.
> 
> Bug: 997885
> Change-Id: I82624e44024e273a343c20e3707cb1d97e31d594
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864026
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#706548}

TBR=xiyuan@chromium.org,xdai@chromium.org

Change-Id: I6a9b5666e168dab72d4192036c44d093388c4225
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 997885
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865556Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706616}