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ContentSuggestions is enabled to 100%, the GoogleLandingMediator won't
be used anymore.
Saving the favicons for the Content widget should be done from the
ContentSuggestionsMediator.

Bug: 764720
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I31667a896cfdbe378d0efa6b67df5c8e9189d4d7
Reviewed-on: https://chromium-review.googlesource.com/776798Reviewed-by: Elodie Banel <lod@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517447}