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This is to avoid specifying the same rewrites over and over again,
during the Polymer 3 migration.

Bug: 1026426
Change-Id: If866cd3e8c5be2d3a2344a20ead7cdaaae3a43ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040431
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738754}