Remove useless references to unsupported windows versions (2)

This CL goes over the ui/ directory.

Bug: 579196
Change-Id: I028c2d04d9851e0861ca0f53832f7bafe4e99098
Reviewed-on: https://chromium-review.googlesource.com/565958
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485665}
10 files changed