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This reverts commit 6381a942.

Reason for revert: Causing heap use after free on ASAN bots.
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=unit_tests&tests=TabStripTest.TabCloseButtonVisibilityWhenNotStacked
https://ci.chromium.org/p/chromium/builders/ci/Mac%20ASan%2064%20Tests%20%281%29/55741
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8905195500078197360/+/steps/unit_tests/0/logs/Deterministic_failure:_TabStripTest.TabCloseButtonVisibilityWhenNotStacked__x2f_0__status_CRASH_/0

Original change's description:
> Turn tab hover cards on by default on TOT.
> 
> Stable approval has been given for 76 in crbug/962604.
> 
> Bug: 910739
> Change-Id: If66c3c8954794126ff194c3d681c3cc71ec20759
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747977
> Commit-Queue: Caroline Rising <corising@chromium.org>
> Reviewed-by: Peter Boström <pbos@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#686596}

TBR=pbos@chromium.org,corising@chromium.org

Change-Id: I361c919fb44bbe44aa7e028845693b44429f51d6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 910739
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1753844Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686743}