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Add new light/dark illustrations to the cookies page, security page, and permissions page

Bug: 1032584
Change-Id: Ibe2b9e9de215581129d24eb7ee5789291e7ebf0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120425
Commit-Queue: Sean Harrison <harrisonsean@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755300}