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

Source/core/css/CSSPropertySourceData.cpp

 /*
  * Copyright (c) 2010 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 75 matching lines @@
 }
 
 String CSSPropertySourceData::toString() const
 {
     DEFINE_STATIC_LOCAL(String, emptyValue, ("e"));
     if (!name && value == emptyValue)
         return String();
 
     StringBuilder result;
     if (disabled)
-        result.append("/* ");
+        result.appendLiteral("/* ");
     result.append(name);
     result.appendLiteral(": ");
     result.append(value);
     if (important)
         result.appendLiteral(" !important");
     result.append(';');
     if (disabled)
-        result.append(" */");
+        result.appendLiteral(" */");
     return result.toString();
 }
 
 unsigned CSSPropertySourceData::hash() const
 {
     return StringHash::hash(name) + 3 * StringHash::hash(value) + 7 * important + 13 * parsedOk + 31;
 }
 
 void CSSRuleSourceData::trace(Visitor* visitor)
 {
     visitor->trace(ruleHeaderRange);
     visitor->trace(ruleBodyRange);
     visitor->trace(selectorRanges);
     visitor->trace(styleSourceData);
     visitor->trace(childRules);
 }
 
 } // namespace blink