String replaceWithLiteral should just use strlen, also rename to replace.

third_party/WebKit/Source/core/layout/line/InlineTextBox.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 599 matching lines @@
 String InlineTextBox::text() const
 {
     return getLineLayoutItem().text().substring(start(), len());
 }
 
 #ifndef NDEBUG
 
 void InlineTextBox::showBox(int printedCharacters) const
 {
     String value = text();
-    value.replaceWithLiteral('\\', "\\\\");
-    value.replaceWithLiteral('\n', "\\n");
+    value.replace('\\', "\\\\");
+    value.replace('\n', "\\n");
     printedCharacters += fprintf(stderr, "%s %p", boxName(), this);
     for (; printedCharacters < showTreeCharacterOffset; printedCharacters++)
         fputc(' ', stderr);
     const LineLayoutText obj = getLineLayoutItem();
     printedCharacters = fprintf(stderr, "\t%s %p", obj.name(), obj.debugPointer());
     const int layoutObjectCharacterOffset = 75;
     for (; printedCharacters < layoutObjectCharacterOffset; printedCharacters++)
         fputc(' ', stderr);
     fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data());
 }
 
 #endif
 
 } // namespace blink