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where it makes sense to do so in existing code.

This migration shook out a couple of bugs in mach_logging.h carried over
from mac_logging.h (fixed there too).

R=rsesek@chromium.org, sky@chromium.org

Review URL: https://codereview.chromium.org/278923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269829 0039d316-1c4b-4281-b951-d872f2087c98