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This change prepares several Windows-only sections of //ui for the
switch of base::string16 to std::u16string.

Bug: 911896
Change-Id: Ic4b707c19f0a53d4d11ff9b5cb1be0afacafd711
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434343Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813508}