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Removed src/components/ButtonBar/src/private/MDCButtonBarButton+Private.h

Bug: 833726
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I141ee872a3255039f35a5bb9bf0aecd77277b435
Reviewed-on: https://chromium-review.googlesource.com/1014499Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551328}