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

Source/core/css/MediaQuery.cpp

 /*
  * CSS Media Query
  *
  * Copyright (C) 2005, 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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
@@ skipping 25 matching lines @@
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 // http://dev.w3.org/csswg/cssom/#serialize-a-media-query
 String MediaQuery::serialize() const
 {
     StringBuilder result;
     switch (m_restrictor) {
     case MediaQuery::Only:
-        result.append("only ");
+        result.appendLiteral("only ");
         break;
     case MediaQuery::Not:
-        result.append("not ");
+        result.appendLiteral("not ");
         break;
     case MediaQuery::None:
         break;
     }
 
     if (m_expressions->isEmpty()) {
         result.append(m_mediaType);
         return result.toString();
     }
 
     if (m_mediaType != MediaTypeNames::all || m_restrictor != None) {
         result.append(m_mediaType);
-        result.append(" and ");
+        result.appendLiteral(" and ");
     }
 
     result.append(m_expressions->at(0)->serialize());
     for (size_t i = 1; i < m_expressions->size(); ++i) {
-        result.append(" and ");
+        result.appendLiteral(" and ");
         result.append(m_expressions->at(i)->serialize());
     }
     return result.toString();
 }
 
 static bool expressionCompare(const OwnPtrWillBeMember<MediaQueryExp>& a, const OwnPtrWillBeMember<MediaQueryExp>& b)
 {
     return codePointCompare(a->serialize(), b->serialize()) < 0;
 }
 
@@ skipping 58 matching lines @@
 void MediaQuery::trace(Visitor* visitor)
 {
     // We don't support tracing of vectors of OwnPtrs (ie. OwnPtr<Vector<OwnPtr<MediaQuery> > >).
     // Since this is a transitional object we are just ifdef'ing it out when oilpan is not enabled.
 #if ENABLE(OILPAN)
     visitor->trace(m_expressions);
 #endif
 }
 
 }