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When the flag is on, chrome://settings serves the Polymer3 version.

Bug: 1026426
Change-Id: I376abc974caa2772cd70ff4ce6f4d4b28b5b1796
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2137912
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@{#756922}