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We have introduced maxWidthLandscape and maxWidthPortrait, so maxWidth
can be removed, because:

1. Functionality overlap, and unnecessary complexity when using this
widget.

2. maxWidthLandscape/maxWidthPortrait can force people to notice
the difference between landscape and portrait views.

TBR=twellington@chromium.org

Bug: 852545
Change-Id: I3532701b3886969d8232a348ae36738ea3dc4259
Reviewed-on: https://chromium-review.googlesource.com/1099774
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: Becky Zhou <huayinz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568080}