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This is in preparation for using favicons in WebLayer, which won't
use history.

BUG=1076463
TEST=covered by tests

Change-Id: I4adc5bd015cfdda16e3189f30df5a854dc0a4a05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2305038Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789675}