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

tests/compiler/dart2js/resolver_test.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.
 
 #import('dart:uri');
 
 #import("../../../lib/compiler/implementation/leg.dart");
 #import("../../../lib/compiler/implementation/elements/elements.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 #import("../../../lib/compiler/implementation/scanner/scannerlib.dart");
@@ skipping 68 matching lines @@
 }
 
 testTypeVariables() {
   matchResolvedTypes(visitor, text, name, expectedElements) {
     VariableDefinitions definition = parseStatement(text);
     visitor.visit(definition.type);
     InterfaceType type = visitor.mapping.getType(definition.type);
     Expect.equals(definition.type.typeArguments.length(),
                   length(type.arguments));
     int index = 0;
-    Link<Type> arguments = type.arguments;
+    Link<DartType> arguments = type.arguments;
     while (!arguments.isEmpty()) {
       Expect.equals(true, index < expectedElements.length);
       Expect.equals(expectedElements[index], arguments.head.element);
       index++;
       arguments = arguments.tail;
     }
     Expect.equals(index, expectedElements.length);
   }
 
   MockCompiler compiler = new MockCompiler();
@@ skipping 502 matching lines @@
   compiler = new MockCompiler();
   compiler.parseScript("""class A extends B {}
                           class B extends C {}
                           class C {}
                           main() { return new A(); }""");
   mainElement = compiler.mainApp.find(MAIN);
   compiler.resolver.resolve(mainElement);
   Expect.equals(0, compiler.warnings.length);
   Expect.equals(0, compiler.errors.length);
   ClassElement aElement = compiler.mainApp.find(buildSourceString("A"));
-  Link<Type> supertypes = aElement.allSupertypes;
+  Link<DartType> supertypes = aElement.allSupertypes;
   Expect.equals(<String>['B', 'C', 'Object'].toString(),
                 asSortedStrings(supertypes).toString());
 }
 
 testInitializers() {
   String script;
   script = """class A {
                 int foo; int bar;
                 A() : this.foo = 1, bar = 2;
               }""";
@@ skipping 159 matching lines @@
         var d = new D();
         --d;
       }""";
   final compiler = compileScript(script);
 
   checkMemberResolved(compiler, 'A', operatorName('+', false));
   checkMemberResolved(compiler, 'B', operatorName('+', false));
   checkMemberResolved(compiler, 'C', operatorName('-', false));
   checkMemberResolved(compiler, 'D', operatorName('-', false));
 }