Fix CC*Renderer and CC*LayerImpl to compile with Clang

cc/CCTextureLayerImpl.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CCTextureLayerImpl_h
 #define CCTextureLayerImpl_h
 
 #include "CCLayerImpl.h"
 
 namespace cc {
@@ skipping 16 matching lines @@
 
     unsigned textureId() const { return m_textureId; }
     void setTextureId(unsigned id) { m_textureId = id; }
     void setPremultipliedAlpha(bool premultipliedAlpha) { m_premultipliedAlpha = premultipliedAlpha; }
     void setFlipped(bool flipped) { m_flipped = flipped; }
     void setUVRect(const FloatRect& rect) { m_uvRect = rect; }
 
 private:
     explicit CCTextureLayerImpl(int);
 
-    virtual const char* layerTypeAsString() const OVERRIDE { return "TextureLayer"; }
+    virtual const char* layerTypeAsString() const OVERRIDE;
 
     unsigned m_textureId;
     CCResourceProvider::ResourceId m_externalTextureResource;
     bool m_premultipliedAlpha;
     bool m_flipped;
     FloatRect m_uvRect;
 };
 
 }
 
 #endif // CCTextureLayerImpl_h