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

Source/platform/PODRedBlackTree.h

 /*
  * 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
@@ skipping 779 matching lines @@
             WTF_LOG_ERROR("%s", output);
     }
 #endif
 
 #ifndef NDEBUG
     // Dumps the subtree rooted at the given node.
     void dumpFromNode(Node* node, int indentation) const
     {
         StringBuilder builder;
         for (int i = 0; i < indentation; i++)
-            builder.append(" ");
-        builder.append("-");
+            builder.append(' ');
+        builder.append('-');
         if (node) {
-            builder.append(" ");
+            builder.append(' ');
             builder.append(ValueToString<T>::string(node->data()));
             builder.append((node->color() == Black) ? " (black)" : " (red)");
         }
         WTF_LOG_ERROR("%s", builder.toString().ascii().data());
         if (node) {
             dumpFromNode(node->left(), indentation + 2);
             dumpFromNode(node->right(), indentation + 2);
         }
     }
 #endif
 
     //----------------------------------------------------------------------
     // Data members
 
     RefPtr<PODFreeListArena<Node> > m_arena;
     Node* m_root;
     bool m_needsFullOrderingComparisons;
 #ifndef NDEBUG
     bool m_verboseDebugging;
 #endif
 };
 
 } // namespace blink
 
 #endif // PODRedBlackTree_h