Fixed <rdar://problem/4002505> 8A378: Endlessly animating gif's on http://www.entropy.ch

	Fixed <rdar://problem/4002505> 8A378: Endlessly animating gif's on entropy.ch

	If animated images had no loop count property we were incorrectly
	looping forver.  Note, that in the course of fixing this bug
	I found that ImageIO is incorrectly NOT reporting the loop count
	for a whole class of animated GIFs.

        Reviewed by Ken Kocienda.

        * WebCoreSupport.subproj/WebImageData.m:
        (-[WebImageData _repetitionCount]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8587 268f45cc-cd09-0410-ab3c-d52691b4dbfc