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screen_win.cc cleanup part 6

More simplifications, this time sometimes touching helper functions.

Bug: none
Change-Id: Idaaf4be6c4ec0e70a311333b9bfb8ccf817d99d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108987Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752682}