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This re-enabled SetCustomMask() on NativeViewHostAura for Windows as
the layer related scaling bug has since been fixed.

Bug: 843250, 863268
Change-Id: If7b9e61e6913143e415f0af20e05d7dab91ef665
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366153Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800339}