Revert of Make GrDrawState and GrPaint take GrEffect* instead of GrEffectRef*.

src/gpu/effects/GrDitherEffect.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDitherEffect_DEFINED
 #define GrDitherEffect_DEFINED
 
 #include "GrTypes.h"
 #include "GrTypesPriv.h"
 
-class GrEffect;
+class GrEffectRef;
 
 namespace GrDitherEffect {
     /**
      * Creates an effect that dithers the resulting color to an RGBA8 framebuffer
      */
-    GrEffect* Create();
+    GrEffectRef* Create();
 };
 
 #endif