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native_viewport mojom + app add a lot of unnecessary complexity. For now, this should be a part of the view_manager. A future patch will get rid of native_viewport completely and will teach display_manager to dispense platform_windows.

BUG=487881
Test=internal change only.

Review URL: https://codereview.chromium.org/1149083010

Cr-Commit-Position: refs/heads/master@{#333183}