Rename Type to DartType to avoid conflicts with the class Type in the core library.

lib/compiler/implementation/js_backend/partial_type_tree.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 PartialTypeTree {
 
   final Compiler compiler;
   PartialTypeTreeNode root;
 
   PartialTypeTree(this.compiler);
 
   abstract PartialTypeTreeNode newNode(ClassElement type);
 
   // TODO(kasperl): Move this to the Selector class?
   ClassElement selectorType(Selector selector) {
-    Type type = selector.receiverType;
+    DartType type = selector.receiverType;
     return (type !== null) ? type.element : compiler.objectClass;
   }
 
   /**
    * Finds the tree node corresponding to the given [type]. If [insert]
    * is true, we always return a node that matches the type by
    * inserting a new node if necessary. If [insert] is false, we
    * return null if we cannot find a node that matches the [type].
    */
   PartialTypeTreeNode findNode(ClassElement type, bool insert) {
@@ skipping 93 matching lines @@
   bool visitRecursively(bool visit(PartialTypeTreeNode node)) {
     if (!visit(this)) return false;
     for (Link link = children; !link.isEmpty(); link = link.tail) {
       PartialTypeTreeNode child = link.head;
       if (!child.visitRecursively(visit)) return false;
     }
     return true;
   }
 
 }