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We do this as a preparation for future patches that will add new
properties associated to favicons, that are relevant for UMA logging in
various places.

Bug: 773593
Change-Id: Ifa99e90c84b90f8dd254a81f791b817a01e5526b
Reviewed-on: https://chromium-review.googlesource.com/711836
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508676}