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This is in preparation of further refactoring of the
settings-site-settings-page UI element.

Bug: 1032584
Change-Id: I0b93a853d97d1141eb7bca215ad23e2a36e27851
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065913
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743208}