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The params class sets default parameters for specific platforms, particularly desktop (which should not need to specify min size and desired size, and should store icons as IconType::kFavicon). Also added a separate Google Favicon Service client to be used on desktop. These will be used in the upcoming NTP redesign.

Bug: 837798
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ib1a78c49a2518acffdc8f1f7c746a751377cfb45
Reviewed-on: https://chromium-review.googlesource.com/1031562Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556922}