Remove SkImageRef and related functionality.

src/images/SkImageRefPool.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 SkImageRefPool_DEFINED
-#define SkImageRefPool_DEFINED
-
-#include "SkTypes.h"
-
-class SkImageRef;
-class SkImageRef_GlobalPool;
-
-class SkImageRefPool {
-public:
-    SkImageRefPool();
-    ~SkImageRefPool();
-
-    size_t  getRAMBudget() const { return fRAMBudget; }
-    void    setRAMBudget(size_t);
-
-    size_t  getRAMUsed() const { return fRAMUsed; }
-    void    setRAMUsed(size_t limit);
-
-    void addToHead(SkImageRef*);
-    void addToTail(SkImageRef*);
-    void detach(SkImageRef*);
-
-    void dump() const;
-
-private:
-    size_t fRAMBudget;
-    size_t fRAMUsed;
-
-    int         fCount;
-    SkImageRef* fHead, *fTail;
-
-    int computeCount() const;
-
-    friend class SkImageRef_GlobalPool;
-
-    void justAddedPixels(SkImageRef*);
-    void canLosePixels(SkImageRef*);
-    void purgeIfNeeded();
-};
-
-#endif