Use StringBuilder::appendLiteral() / StringBuilder::append(char) when possible

Source/core/svg/SVGPathStringBuilder.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010-2011. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 115 matching lines @@
     appendFloat(m_stringBuilder, r2);
     appendFloat(m_stringBuilder, angle);
     appendBool(m_stringBuilder, largeArcFlag);
     appendBool(m_stringBuilder, sweepFlag);
     appendPoint(m_stringBuilder, targetPoint);
     m_stringBuilder.append(' ');
 }
 
 void SVGPathStringBuilder::closePath()
 {
-    m_stringBuilder.append("Z ");
+    m_stringBuilder.appendLiteral("Z ");
 }
 
 } // namespace blink