add protected method for internal_dispose overrides to jam fRefCnt before
calling destructor.

move SkTRefArray to actually inherit from SkRefCnt
Review URL: https://codereview.appspot.com/6422057

git-svn-id: http://skia.googlecode.com/svn/trunk@4719 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed