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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

Cr-Commit-Position: refs/heads/master@{#292699}