Revert of Remove StringBuilder::appendLiteral.

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

 /*
  * Copyright (C) 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 115 matching lines @@
     }
     if (m_cachedToImage) {
         m_cachedToImage->removeObserver(&m_crossfadeSubimageObserver);
         m_cachedToImage = nullptr;
     }
 }
 
 String CSSCrossfadeValue::customCSSText() const
 {
     StringBuilder result;
-    result.append("-webkit-cross-fade(");
+    result.appendLiteral("-webkit-cross-fade(");
     result.append(m_fromValue->cssText());
-    result.append(", ");
+    result.appendLiteral(", ");
     result.append(m_toValue->cssText());
-    result.append(", ");
+    result.appendLiteral(", ");
     result.append(m_percentageValue->cssText());
     result.append(')');
     return result.toString();
 }
 
 CSSCrossfadeValue* CSSCrossfadeValue::valueWithURLsMadeAbsolute()
 {
     CSSValue* fromValue = m_fromValue;
     if (m_fromValue->isImageValue())
         fromValue = toCSSImageValue(*m_fromValue).valueWithURLMadeAbsolute();
@@ skipping 141 matching lines @@
     visitor->trace(m_fromValue);
     visitor->trace(m_toValue);
     visitor->trace(m_percentageValue);
     visitor->trace(m_cachedFromImage);
     visitor->trace(m_cachedToImage);
     visitor->trace(m_crossfadeSubimageObserver);
     CSSImageGeneratorValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink