Update dart2js unit tests to new library API.

dart/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 "../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart"
        hide TreeElementMapping, TreeElements, SourceString;
 import "../../../sdk/lib/_internal/compiler/implementation/resolution/resolution.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/elements/elements.dart";
@@ skipping 66 matching lines @@
   testToString();
   testIndexedOperator();
   testIncrementsAndDecrements();
 }
 
 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(),
+    Expect.equals(definition.type.typeArguments.slowLength(),
                   length(type.typeArguments));
     int index = 0;
     Link<DartType> arguments = type.typeArguments;
     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);
@@ skipping 127 matching lines @@
 testLocalsTwo() {
   MockCompiler compiler = new MockCompiler();
   ResolverVisitor visitor = compiler.resolverVisitor();
   Node tree = parseStatement("if (true) { var a = 1; var b = 2; }");
   Element element = visitor.visit(tree);
   Expect.equals(null, element);
   MethodScope scope = visitor.scope;
   Expect.equals(0, scope.elements.length);
   Expect.equals(2, map(visitor).length);
 
-  List<Element> elements = map(visitor).values;
+  List<Element> elements = new List<Element>.from(map(visitor).values);
   Expect.notEquals(elements[0], elements[1]);
 }
 
 testLocalsThree() {
   MockCompiler compiler = new MockCompiler();
   ResolverVisitor visitor = compiler.resolverVisitor();
   Node tree = parseStatement("{ var a = 1; if (true) { a; } }");
   Element element = visitor.visit(tree);
   Expect.equals(null, element);
   MethodScope scope = visitor.scope;
@@ skipping 592 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));
 }