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

include/core/SkImageFilter.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImageFilter_DEFINED
 #define SkImageFilter_DEFINED
 
@@ skipping 33 matching lines @@
         uint32_t flags() const { return fFlags; }
         const SkRect& rect() const { return fRect; }
     private:
         SkRect fRect;
         uint32_t fFlags;
     };
 
     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;
         virtual void set(const SkImageFilter* key,
                          const SkBitmap& result, const SkIPoint& offset) = 0;
         virtual void remove(const SkImageFilter* key) = 0;
     };
 
     class Context {
     public:
@@ skipping 217 matching lines @@
                              const SkIRect& bounds) const;
 
 private:
     typedef SkFlattenable INHERITED;
     int fInputCount;
     SkImageFilter** fInputs;
     CropRect fCropRect;
 };
 
 #endif