change pixelref to not inherit from SkFlattenable

include/gpu/SkGrPixelRef.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGrPixelRef_DEFINED
 #define SkGrPixelRef_DEFINED
 
@@ skipping 33 matching lines @@
      * Constructs a pixel ref around a GrSurface. If the caller has locked the GrSurface in the
      * cache and would like the pixel ref to unlock it in its destructor then transferCacheLock
      * should be set to true.
      */
     SkGrPixelRef(const SkImageInfo&, GrSurface*, bool transferCacheLock = false);
     virtual ~SkGrPixelRef();
 
     // override from SkPixelRef
     virtual GrTexture* getTexture() SK_OVERRIDE;
 
+#ifdef SK_SUPPORT_LEGACY_PIXELREF_UNFLATTENABLE
     SK_DECLARE_UNFLATTENABLE_OBJECT()
+#endif
 
 protected:
     // overrides from SkPixelRef
     virtual bool onReadPixels(SkBitmap* dst, const SkIRect* subset) SK_OVERRIDE;
     virtual SkPixelRef* deepCopy(SkColorType, const SkIRect* subset) SK_OVERRIDE;
 
 private:
     GrSurface*  fSurface;
     bool        fUnlock;   // if true the pixel ref owns a texture cache lock on fSurface
 
     typedef SkROLockPixelsPixelRef INHERITED;
 };
 
 #endif