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

Source/core/inspector/InspectorStyleSheet.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:
  * 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 729 matching lines @@
         for (unsigned i = 0; i < m_style->length(); ++i) {
             String individualProperty = m_style->item(i);
             if (m_style->getPropertyShorthand(individualProperty) != shorthandProperty)
                 continue;
             if (m_style->isPropertyImplicit(individualProperty))
                 continue;
             String individualValue = m_style->getPropertyValue(individualProperty);
             if (individualValue == "initial")
                 continue;
             if (!builder.isEmpty())
-                builder.append(" ");
+                builder.append(' ');
             builder.append(individualValue);
         }
 
         return builder.toString();
     }
     return value;
 }
 
 NewLineAndWhitespace& InspectorStyle::newLineAndWhitespaceDelimiters() const
 {
@@ skipping 1055 matching lines @@
 void InspectorStyleSheetForInlineStyle::trace(Visitor* visitor)
 {
     visitor->trace(m_element);
     visitor->trace(m_ruleSourceData);
     visitor->trace(m_inspectorStyle);
     InspectorStyleSheetBase::trace(visitor);
 }
 
 } // namespace blink