Today's lesson in not using Apple's private methods: somewhere between old/886f95f00431 and #9620 Apple changed their document icon setup process. Use the new methods and fix #9620.
(transplanted from 5cf365ce9352d25978ffd6073d3bc07573aba518)
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//Our dock icon can run its animation at any speed, but we want to try and sync it with the global Adium flashing. To do this, we delay starting our timer until the next flash occurs.