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This will visualize the world default favicon for collections that use FaviconLoader.

Bug: 847795

Change-Id: I0d0b3cfacd79bcf0510bed3b98397cc00ee57c6d
Reviewed-on: https://chromium-review.googlesource.com/1089882Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565651}