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

Source/core/css/CSSMediaRule.cpp

 /**
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2012 Apple Computer, Inc.
  * Copyright (C) 2006 Samuel Weinig (sam@webkit.org)
  *
  * 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 31 matching lines @@
 }
 
 MediaQuerySet* CSSMediaRule::mediaQueries() const
 {
     return toStyleRuleMedia(m_groupRule.get())->mediaQueries();
 }
 
 String CSSMediaRule::cssText() const
 {
     StringBuilder result;
-    result.append("@media ");
+    result.appendLiteral("@media ");
     if (mediaQueries()) {
         result.append(mediaQueries()->mediaText());
         result.append(' ');
     }
     result.appendLiteral("{ \n");
     appendCSSTextForItems(result);
     result.append('}');
     return result.toString();
 }
 
@@ skipping 12 matching lines @@
     if (m_mediaCSSOMWrapper && mediaQueries())
         m_mediaCSSOMWrapper->reattach(mediaQueries());
 }
 
 void CSSMediaRule::trace(Visitor* visitor)
 {
     visitor->trace(m_mediaCSSOMWrapper);
     CSSGroupingRule::trace(visitor);
 }
 } // namespace blink