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Load the favicons shown in chrome://discards via cr.icon instead of
doing a direct network request from WebUI.

Remove LifecycleUnit::GetIconURL() which is now unused.

Bug: 837420
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I0ce123cdf944ace2e03b2b56feb18402848f875d
Reviewed-on: https://chromium-review.googlesource.com/1031783
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555291}