Revert "Enable positional parameters for base::vsnprintf and base::vswprintf on Windows."
This reverts r127788. Positional parameters aren't part of the C standard
(they are part of POSIX though), we don't really use them in the codebase,
and they don't work in chrome/android with libc++. Rather
than have a test for them, make them also not work on Windows (like they
originally didn't) -- we shouldn't use positional printf parameters anyways.
Change the 5 uses to not use positional parameters.
BUG=118064,117028,427718
Review URL: https://codereview.chromium.org/
902643002
Cr-Commit-Position: refs/heads/master@{#314963}