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In WebLayer incognito profiles are not backed by a real profile.
This means there is no FaviconService to use in this case. This
makes FaviconHandler/Driver work with a null service so that
WebLayer can still offer favicons in incognito mode.

BUG=1076463
TEST=none

Change-Id: Idc049f37c469576720847ed817453b17ec519aea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339550Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796443}