Revert of Remove StringBuilder::appendLiteral.

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

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2012 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 44 matching lines @@
         m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_styleRule->mutableProperties(), const_cast<CSSStyleRule*>(this));
     }
     return m_propertiesCSSOMWrapper.get();
 }
 
 String CSSStyleRule::generateSelectorText() const
 {
     StringBuilder builder;
     for (const CSSSelector* selector = m_styleRule->selectorList().first(); selector; selector = CSSSelectorList::next(*selector)) {
         if (selector != m_styleRule->selectorList().first())
-            builder.append(", ");
+            builder.appendLiteral(", ");
         builder.append(selector->selectorText());
     }
     return builder.toString();
 }
 
 String CSSStyleRule::selectorText() const
 {
     if (hasCachedSelectorText()) {
         ASSERT(selectorTextCache().contains(this));
         return selectorTextCache().get(this);
@@ skipping 20 matching lines @@
     if (hasCachedSelectorText()) {
         selectorTextCache().remove(this);
         setHasCachedSelectorText(false);
     }
 }
 
 String CSSStyleRule::cssText() const
 {
     StringBuilder result;
     result.append(selectorText());
-    result.append(" { ");
+    result.appendLiteral(" { ");
     String decls = m_styleRule->properties().asText();
     result.append(decls);
     if (!decls.isEmpty())
         result.append(' ');
     result.append('}');
     return result.toString();
 }
 
 void CSSStyleRule::reattach(StyleRuleBase* rule)
 {
@@ skipping 11 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(CSSStyleRule)
 {
     visitor->traceWrappers(parentRule());
     visitor->traceWrappers(parentStyleSheet());
     CSSRule::traceWrappers(visitor);
 }
 
 } // namespace blink