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This change makes std::wstring usage explicit in //base/win. Exposing
std::wstring in the //base/win interfaces will make it easier to
prepare other Windows only code for a future where base::string16 is
no longer std::wstring.

Bug: 911896
Change-Id: I7f214d0ea1d72d80f8b510eb9e22ae7ef1a2f988
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789388
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695547}