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This method was only used for reseting the background.

Bug: None.
Change-Id: I64b35e1832cf739324230d1b4e5460a18d83d0bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719831
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685238}