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Currently the favicon shown for etld+1 is simply using the favicon of
the first origin. This CL implement heuristic for finding a good
favicon.
The rules are:
1. Find the origin with format "www.etld+1".
2. If there is no origin with format "www.etld+1", find the origin with
largest storage, and use the number of cookies as tie breaker.

BUG=930626,835712

Change-Id: I374e079568020a7a6df6ec80e65736c29eead9ba
Reviewed-on: https://chromium-review.googlesource.com/c/1475561Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Patti <patricialor@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634397}