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}

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