Many type fixes.

lib/compiler/implementation/tree/unparser.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class Unparser implements Visitor {
   StringBuffer sb;
   final bool printDebugInfo;
 
   Unparser([this.printDebugInfo = false]);
 
@@ skipping 101 matching lines @@
   }
 
   visitLiteralInt(LiteralInt node) {
     add(node.token.value);
   }
 
   visitLiteralString(LiteralString node) {
     add(node.token.value);
   }
 
-  visitStringJuxtaposition(LiteralStringJuxtaposition node) {
+  visitStringJuxtaposition(StringJuxtaposition node) {
     visit(node.first);
     sb.add(" ");
     visit(node.second);
   }
 
   visitLiteralNull(LiteralNull node) {
     add(node.token.value);
   }
 
   visitNewExpression(NewExpression node) {
@@ skipping 260 matching lines @@
       sb.add(' ');
     }
     visit(node.name);
     if (node.typeParameters !== null) {
       visit(node.typeParameters);
     }
     visit(node.formals);
     add(node.endToken.value);
   }
 }