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Progress track used to be a part of download state icon. Now that state
icon is programatically drawn the track should be a part of
RadialProgressView.

Bug: 820178
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I4b20faa6fbbc622de2763b962cc40539b22d24fc
Reviewed-on: https://chromium-review.googlesource.com/966936
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543910}