WTF::notFound looks too much like a local variable.

Source/core/html/canvas/CanvasRenderingContext2D.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 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>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
@@ skipping 2142 matching lines @@
     FontCachePurgePreventer fontCachePurgePreventer;
     RefPtr<TextMetrics> metrics = TextMetrics::create();
     metrics->setWidth(accessFont().width(TextRun(text)));
     return metrics.release();
 }
 
 static void replaceCharacterInString(String& text, WTF::CharacterMatchFunctionPtr matchFunction, const String& replacement)
 {
     const size_t replacementLength = replacement.length();
     size_t index = 0;
-    while ((index = text.find(matchFunction, index)) != notFound) {
+    while ((index = text.find(matchFunction, index)) != kNotFound) {
         text.replace(index, 1, replacement);
         index += replacementLength;
     }
 }
 
 void CanvasRenderingContext2D::drawTextInternal(const String& text, float x, float y, bool fill, float maxWidth, bool useMaxWidth)
 {
     GraphicsContext* c = drawingContext();
     if (!c)
         return;
@@ skipping 240 matching lines @@
     const int focusRingWidth = 5;
     const int focusRingOutline = 0;
     c->drawFocusRing(path, focusRingWidth, focusRingOutline, focusRingColor);
 
     c->restore();
 
     didDraw(dirtyRect);
 }
 
 } // namespace WebCore