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This is based on a comment from robliao@ in https://crrev.com/c/2099238.
This change avoids converting the UTF-16 device path to a UTF-8 path and
therefore makes it possible to call the W versions of Win32 APIs.

Change-Id: I833c2cc7806cd0a61cbad236ebd9fd1985654635
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106752Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751190}