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This also removes some now-unused Cocoa control classes in //ui/base and
several unneeded resources.

Bug: 739386, 832676
Change-Id: I9289cc5613c4303521aaed9271ddc7574e2611a0
Reviewed-on: https://chromium-review.googlesource.com/c/1343055Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609810}