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Much of process_utils isn't meaningful on iOS, but this provides enough to support unit tests and minimal metrics.

BUG=None
TEST=None


Review URL: https://chromiumcodereview.appspot.com/10698149

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@146123 0039d316-1c4b-4281-b951-d872f2087c98