Mac: Fix more errors from clang to get crash_report.xcodeproj close to compiling.

R=mark@chromium.org

Review URL: https://breakpad.appspot.com/593002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1176 4c0a9323-5329-0410-9bdc-e9ce6186880e