Revert of Remove StringBuilder::appendLiteral.

third_party/WebKit/Source/core/css/MediaQueryExp.cpp

 /*
  * CSS Media Query
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2013 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:
@@ skipping 269 matching lines @@
         && ((!other.m_expValue.isValid() && !m_expValue.isValid())
             || (other.m_expValue.isValid() && m_expValue.isValid() && other.m_expValue.equals(m_expValue)));
 }
 
 String MediaQueryExp::serialize() const
 {
     StringBuilder result;
     result.append('(');
     result.append(m_mediaFeature.lower());
     if (m_expValue.isValid()) {
-        result.append(": ");
+        result.appendLiteral(": ");
         result.append(m_expValue.cssText());
     }
     result.append(')');
 
     return result.toString();
 }
 
 static inline String printNumber(double number)
 {
     return Decimal::fromDouble(number).toString();
@@ skipping 10 matching lines @@
         output.append('/');
         output.append(printNumber(denominator));
     } else if (isID) {
         output.append(getValueName(id));
     }
 
     return output.toString();
 }
 
 } // namespace blink