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Consolidated constants into a single data structure

To enable relayout of Infobar based on experiment flags, consolidation
helps with wholesale changes of these layout constants.

Bug: 804652
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I0764fb5b8c0b85723f6a3e24169d345f6ea24497
Reviewed-on: https://chromium-review.googlesource.com/1033502Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554741}