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This change:

1) Splits up NativeWidgetMacTest.MiniaturizeExternally, which was a bit too big;
2) Adds an override on NativeWidgetMacNSWindow of _canMiniaturize, which
   always allows Views windows to be miniaturized; this is the behavior that
   the rest of Views (and the tests) expect, and is what happened on older SDKs.

Bug: 780980
Change-Id: Ic3356787433d9325aa13f1e01a8165c4ddd07b0a
Reviewed-on: https://chromium-review.googlesource.com/c/1394010Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619656}