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This change modifies base::NativeEnvironmentString to be std::wstring on
Windows and updates affected code.

Bug: 911896
Change-Id: Ib39c473f42a2cd3384dd6fefd11021e4636629c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891311Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712523}