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third_party/polymer/v1_0/minify_polymer.py was using --in-html and
--out-html arguments to Polymer bundler when minifying polymer. These
arguments are no longer valid in bundler v4, so the script was
broken by:
https://chromium-review.googlesource.com/c/chromium/src/+/1857568

Update the script to work with the new version of bundler.

Bug: 921285
Change-Id: I52f82ef3cfb36ec79c61e69aec7185098d19226c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873372Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708280}