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This is used to fetch a previously downloaded favicon. For
consistency this returns the same image as that returned
from FaviconFetcher.

BUG=1076463
TEST=none

Change-Id: Icdd01286d1d564c7cb5b62847ffb1d888d9d70fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340796Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795685}