Cleanup namespace usage in platform/graphics/[G-S]*

Source/platform/graphics/GraphicsTypes.h

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 96 matching lines @@
     ColorFilterLuminanceToAlpha,
     ColorFilterSRGBToLinearRGB,
     ColorFilterLinearRGBToSRGB
 };
 
 enum WindRule {
     RULE_NONZERO = SkPath::kWinding_FillType,
     RULE_EVENODD = SkPath::kEvenOdd_FillType
 };
 
-PLATFORM_EXPORT String compositeOperatorName(CompositeOperator, blink::WebBlendMode);
-PLATFORM_EXPORT bool parseCompositeAndBlendOperator(const String&, CompositeOperator&, blink::WebBlendMode&);
+PLATFORM_EXPORT String compositeOperatorName(CompositeOperator, WebBlendMode);
+PLATFORM_EXPORT bool parseCompositeAndBlendOperator(const String&, CompositeOperator&, WebBlendMode&);
 
 PLATFORM_EXPORT String lineCapName(LineCap);
 PLATFORM_EXPORT bool parseLineCap(const String&, LineCap&);
 
 PLATFORM_EXPORT String lineJoinName(LineJoin);
 PLATFORM_EXPORT bool parseLineJoin(const String&, LineJoin&);
 
 PLATFORM_EXPORT String textAlignName(TextAlign);
 PLATFORM_EXPORT bool parseTextAlign(const String&, TextAlign&);
 
 PLATFORM_EXPORT String textBaselineName(TextBaseline);
 PLATFORM_EXPORT bool parseTextBaseline(const String&, TextBaseline&);
 
 } // namespace blink
 
 #endif