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This CL makes Apple Touch Icon URLs will be parsed in Blink and passed to
FaviconTabHelper::DidUpdateFaviconURL().  This used to be enabled for Android
only.  On desktop the URLs are parsed, but ignored (so storage into Favicon
DB and no image fetching yet).

BUG=467712

Review URL: https://codereview.chromium.org/1007563004

Cr-Commit-Position: refs/heads/master@{#320975}