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NativeCursorManagerAshClassic is the only subclass.

I'm going to rename the file in a follow-up CL to help git rename
tracking preserve the blame history.

Bug: 866532
Change-Id: Icb4a0ee7211a4256d6655797393d22bb43169e77
Reviewed-on: https://chromium-review.googlesource.com/1212143Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589526}