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

Source/modules/websockets/WebSocketExtensionDispatcher.cpp

 /*
  * Copyright (C) 2012 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 49 matching lines @@
 
 const String WebSocketExtensionDispatcher::createHeaderValue() const
 {
     size_t numProcessors = m_processors.size();
     if (!numProcessors)
         return String();
 
     StringBuilder builder;
     builder.append(m_processors[0]->handshakeString());
     for (size_t i = 1; i < numProcessors; ++i) {
-        builder.append(", ");
+        builder.appendLiteral(", ");
         builder.append(m_processors[i]->handshakeString());
     }
     return builder.toString();
 }
 
 void WebSocketExtensionDispatcher::appendAcceptedExtension(const String& extensionToken, HashMap<String, String>& extensionParameters)
 {
     if (!m_acceptedExtensionsBuilder.isEmpty())
-        m_acceptedExtensionsBuilder.append(", ");
+        m_acceptedExtensionsBuilder.appendLiteral(", ");
     m_acceptedExtensionsBuilder.append(extensionToken);
     // FIXME: Should use ListHashSet to keep the order of the parameters.
     for (HashMap<String, String>::const_iterator iterator = extensionParameters.begin(); iterator != extensionParameters.end(); ++iterator) {
-        m_acceptedExtensionsBuilder.append("; ");
+        m_acceptedExtensionsBuilder.appendLiteral("; ");
         m_acceptedExtensionsBuilder.append(iterator->key);
         if (!iterator->value.isNull()) {
-            m_acceptedExtensionsBuilder.append("=");
+            m_acceptedExtensionsBuilder.append('=');
             m_acceptedExtensionsBuilder.append(iterator->value);
         }
     }
 }
 
 void WebSocketExtensionDispatcher::fail(const String& reason)
 {
     m_failureReason = reason;
     m_acceptedExtensionsBuilder.clear();
 }
@@ skipping 46 matching lines @@
         return String();
     return m_acceptedExtensionsBuilder.toString();
 }
 
 String WebSocketExtensionDispatcher::failureReason() const
 {
     return m_failureReason;
 }
 
 } // namespace blink