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This CL adds small tweaks to the UI and layout to bring infobar closer
to Phase 1 design.

Bug: 804652
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ib8da40c032387eb9f7f06ad60e6c3283dea56bf8
Reviewed-on: https://chromium-review.googlesource.com/1036541
Commit-Queue: Peter Lee <pkl@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556183}