Revert of Remove ability for Release code to call getRefCnt() or getWeakRefCnt().

include/core/SkImageFilter.h

Index: include/core/SkImageFilter.h
diff --git a/include/core/SkImageFilter.h b/include/core/SkImageFilter.h
index 15e9a2f0c9eb01da493193760721fb76e8748893..9cdd27599a8a09f1a5d681ed6efd723ffb823c25 100644
--- a/include/core/SkImageFilter.h
+++ b/include/core/SkImageFilter.h
@@ -51,7 +51,6 @@
     class SK_API Cache : public SkRefCnt {
     public:
         // By default, we cache only image filters with 2 or more children.
-        // Values less than 2 mean always cache; values greater than 2 are not supported.
         static Cache* Create(int minChildren = 2);
         virtual ~Cache() {}
         virtual bool get(const SkImageFilter* key, SkBitmap* result, SkIPoint* offset) = 0;