Remove 'friend SkRefCnt' from SkData.

include/core/SkRefCnt.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkRefCnt_DEFINED
@@ skipping 171 matching lines @@
      *  so unref() will not be called in our destructor. A subsequent call to
      *  detach() will do nothing and return null.
      */
     T* detach() {
         T* obj = fObj;
         fObj = NULL;
         return obj;
     }
 
     /**
-     * BlockRef<B> is a type which inherits from B, cannot be created,
-     * and makes ref and unref private.
+     *  BlockRef<B> is a type which inherits from B, cannot be created,
+     *  cannot be deleted, and makes ref and unref private.
      */
     template<typename B> class BlockRef : public B {
     private:
         BlockRef();
+        ~BlockRef();
         void ref() const;
         void unref() const;
     };
 
     /** If T is const, the type returned from operator-> will also be const. */
     typedef typename SkTConstType<BlockRef<T>, SkTIsConst<T>::value>::type BlockRefType;
 
     /**
      *  SkAutoTUnref assumes ownership of the ref. As a result, it is an error
      *  for the user to ref or unref through SkAutoTUnref. Therefore
@@ skipping 48 matching lines @@
     typedef T* SkRefPtr::*unspecified_bool_type;
     operator unspecified_bool_type() const {
         return fObj ? &SkRefPtr::fObj : NULL;
     }
 
 private:
     T* fObj;
 };
 
 #endif