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This change has ViewTreeValidator account for the changed interior structure
of NSButton on 10.14. This fixes FirstRunDialogControllerTest's
LayoutWithLongStrings.

Bug: 892176
Change-Id: Icc9e977034a98fbb587719770c326d082adb3743
Reviewed-on: https://chromium-review.googlesource.com/c/1316113
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605105}