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The Polymer2 version is no longer used, and therefore there is
no need to keep auto-generating the P3 version from P2 at build time.

This is one of many CLs to check-in the Polymer3 version of Settings.

Bug: 1069258
Change-Id: I0879a049b645d5c68890326a81a7761358a6d6fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142108
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759161}