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components/favicon was made to deal with a null CoreFaviconService,
so no changes are necessary in the weblayer side. This adds a
test to ensure it works.

BUG=1076463
TEST=none

Change-Id: I52eafced0f77a3d3a764097dcdca4e0b33b6442e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339288
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796611}