Improve the find word boundary performance

Source/core/editing/VisibleUnits.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple 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 635 matching lines @@
 }
 
 static unsigned endWordBoundary(const UChar* characters, unsigned length, unsigned offset, BoundarySearchContextAvailability mayHaveMoreContext, bool& needMoreContext)
 {
     ASSERT(offset <= length);
     if (mayHaveMoreContext && endOfFirstWordBoundaryContext(characters + offset, length - offset) == static_cast<int>(length - offset)) {
         needMoreContext = true;
         return length;
     }
     needMoreContext = false;
-    int start, end;
-    findWordBoundary(characters, length, offset, &start, &end);
-    return end;
+    return findWordEndBoundary(characters, length, offset);
 }
 
 VisiblePosition endOfWord(const VisiblePosition &c, EWordSide side)
 {
     VisiblePosition p = c;
     if (side == LeftWordIfOnBoundary) {
         if (isStartOfParagraph(c))
             return c;
 
         p = c.previous();
@@ skipping 713 matching lines @@
 {
     return direction == LTR ? logicalStartOfLine(c) : logicalEndOfLine(c);
 }
 
 VisiblePosition rightBoundaryOfLine(const VisiblePosition& c, TextDirection direction)
 {
     return direction == LTR ? logicalEndOfLine(c) : logicalStartOfLine(c);
 }
 
 }