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This is a remnant from when the tile icon images were generated with a
(dark) gray background, depending on the system theme. Now that the tile
background controlled via CSS, it's no longer required to reload the
tiles when the background image is changed in dark mode.

Bug: 986935
Change-Id: Iccd076f354a838e9025856151e1e486824ed4c4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716100Reviewed-by: Kyle Milka <kmilka@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680316}