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This change modifies base::CommandLine::StringType to be std::wstring on
Windows. It relies on changing base::FilePath::StringType to
std::wstring on Windows as well, in order to compile once base::string16
is no longer std::wstring.

Bug: 911896
Change-Id: I07accc7e043fadf2b584799b699881f300e18bb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875748Reviewed-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@{#709226}