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This reverts commit a3d37b5f.

Reason for revert: ChromeOS build bot...
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg
...  started failing a CrSettingsAnimatedPagesTest.All consistently. Reverting to see if this is related. If test continues to fail, we can unrevert.

Original change's description:
> Settings: Port on_startup_page/* to Polymer 3
> 
> - Autogenerate Polymer 3 versions for files in on_startup_page/*
> - Update closure compiler and polymer_modulizer/js_modulizer targets
>   for these files
> - Autogenerate tests for the Polymer 3 files
> 
> Bug: 1026426
> Change-Id: I122bcb77d366b7fc7fd979b235d13d283faf8d43
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040626
> Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
> Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#739259}

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

Change-Id: I91d6a678ce1d1b0324ca4da0746981982cf35e73
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1026426
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2044113Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739376}