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These changes have been mostly generated with a local script,
followed by some manual editing.

Execute the following target locally
ninja -C out/gchromeos/ chrome/browser/resources/settings/chromeos:polymer3_elements

or just the following with optimize_webui=false (for now)
ninja -C out/gchromeos/ chrome

Problematic *_module targets that are causing build errors to be thrown
from polymer.py have been commented out and a TODO has been added for
each of them. For example
 - wherever cr.define() calls exist, they need to include the
   contents of the entire file
 - A single <script> tag is expected in an HTML file

Bug: 1045266
Change-Id: I6a9c98fe55d6d270e36d620b1aef1fef2fe8b8ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2133048
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756124}