GitLab

This is an intermediary CL.
The end goal is having the FaviconServiceFactory be able to obtain a FaviconClient to pass it to the FaviconService's constructor.

BUG=377505

Review URL: https://codereview.chromium.org/301613004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276642 0039d316-1c4b-4281-b951-d872f2087c98