clang/win: Fix a few warnings in targets not in chromium_builder_tests.

Also don't use "default" as a variable name, as it's a keyword.
Also fix a bug where a wstring was passed to %ls.

No real behavior change.

BUG=82385
R=hans@chromium.org
TBR=cpu, vitalybuka

Review URL: https://codereview.chromium.org/526513002
7 files changed