remove duplicate friend declaration

third_party/WebKit/Source/platform/graphics/GraphicsLayer.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 261 matching lines @@
 protected:
     String debugName(cc::Layer*) const;
     bool shouldFlattenTransform() const { return m_shouldFlattenTransform; }
 
     explicit GraphicsLayer(GraphicsLayerClient*);
     // GraphicsLayerFactoryChromium that wants to create a GraphicsLayer need to be friends.
     friend class GraphicsLayerFactoryChromium;
     // for testing
     friend class CompositedLayerMappingTest;
     friend class FakeGraphicsLayerFactory;
-    friend class CompositedLayerMappingTest;
 
 private:
     // Adds a child without calling updateChildList(), so that adding children
     // can be batched before updating.
     void addChildInternal(GraphicsLayer*);
 
 #if ENABLE(ASSERT)
     bool hasAncestor(GraphicsLayer*) const;
 #endif
 
@@ skipping 89 matching lines @@
 };
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the blink namespace for ease of invocation from gdb.
 void PLATFORM_EXPORT showGraphicsLayerTree(const blink::GraphicsLayer*);
 #endif
 
 #endif // GraphicsLayer_h