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This reverts commit 8aee0918.

Reason for revert: Test being added is flaky. See
https://bugs.chromium.org/p/chromium/issues/detail?id=1066619

Original change's description:
> Add MainSettingsFragmentTest
> 
> MainSettings.java have bit less test coverage over some of the
> preferences, for example, the HomepageSettings at this moment. Adding
> MainSettingsFragmentTest is aiming for more test coverage for the
> list of preferences on the settings screen.
> 
> Bug: 1052060, 1066362
> Change-Id: Ib51c133f2a73f4ec85cc185c4101833bc3fa0b58
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124729
> Commit-Queue: Wenyu Fu <wenyufu@chromium.org>
> Reviewed-by: Theresa  <twellington@chromium.org>
> Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#754957}

TBR=twellington@chromium.org,wychen@chromium.org,chouinard@chromium.org,wenyufu@chromium.org

Change-Id: If15e22de962484fc87b3b5dc5eb1cfcf550cf024
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1052060, 1066362
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131017Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755115}