Remove duplicated headers from core/

Source/core/html/canvas/CanvasStyle.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  *
  * 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
@@ skipping 18 matching lines @@
 #include "config.h"
 #include "core/html/canvas/CanvasStyle.h"
 
 #include "CSSPropertyNames.h"
 #include "core/css/CSSParser.h"
 #include "core/css/StylePropertySet.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/canvas/CanvasGradient.h"
 #include "core/html/canvas/CanvasPattern.h"
 #include "core/platform/graphics/GraphicsContext.h"
-#include "wtf/Assertions.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 enum ColorParseResult { ParsedRGBA, ParsedCurrentColor, ParsedSystemColor, ParseFailed };
 
 static ColorParseResult parseColor(RGBA32& parsedColor, const String& colorString, Document* document = 0)
 {
     if (equalIgnoringCase(colorString, "currentcolor"))
         return ParsedCurrentColor;
@@ skipping 215 matching lines @@
         context->setFillPattern(canvasPattern()->pattern());
         break;
     case CurrentColor:
     case CurrentColorWithOverrideAlpha:
         ASSERT_NOT_REACHED();
         break;
     }
 }
 
 }