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Custom margins break when the previewed content is rotated. Rotating is
also a very rare user action in print preview, and it is already
unavailable through a UI.

Remove the keyboard shortcuts and the context menu options.

Bug: 275471
Change-Id: Ia8e9e0efa0c2a676bd0e7a916e1fa848a4a21527
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527905Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826347}