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This reverts commit d5544fc0.

Reason for revert: Suspect for continuously failing CrSettingsAnimatedPagesV3Test.All and CrSettings* related tests
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/16982

Original change's description:
> Settings: Port settings_menu/ to Polymer 3.
> 
> Bug: 1026426
> Change-Id: Id6b62c39b9184532a8e3e3c34c2bdee98a37240e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2045171
> Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
> Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
> Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740247}

TBR=dpapad@chromium.org,rbpotter@chromium.org

Change-Id: I029222c3bee9a354964d4d5fa8d02f724c7c4039
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1026426
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050868Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740350}