Make GrCacheable implement its own ref counting.

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 95 matching lines @@
     /**
      *  Called when the ref count goes to 0.
      */
     virtual void internal_dispose() const {
         this->internal_dispose_restore_refcnt_to_1();
         SkDELETE(this);
     }
 
     // The following friends are those which override internal_dispose()
     // and conditionally call SkRefCnt::internal_dispose().
-    friend class GrTexture;
     friend class SkWeakRefCnt;
 
     mutable int32_t fRefCnt;
 
     typedef SkNoncopyable INHERITED;
 };
 
 #ifdef SK_REF_CNT_MIXIN_INCLUDE
 // It is the responsibility of the following include to define the type SkRefCnt.
 // This SkRefCnt should normally derive from SkRefCntBase.
@@ skipping 115 matching lines @@
 };
 // Can't use the #define trick below to guard a bare SkAutoTUnref(...) because it's templated. :(
 
 class SkAutoUnref : public SkAutoTUnref<SkRefCnt> {
 public:
     SkAutoUnref(SkRefCnt* obj) : SkAutoTUnref<SkRefCnt>(obj) {}
 };
 #define SkAutoUnref(...) SK_REQUIRE_LOCAL_VAR(SkAutoUnref)
 
 #endif