Change TypeMask.base to be a ClassElement.

tests/compiler/dart2js/patch_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:async';
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/elements/elements.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart";
@@ skipping 712 matching lines @@
 
     ensure(compiler, "clear", cls.lookupLocalMember,
            checkHasBody: true, expectIsPatched: true);
 
     compiler.phase = Compiler.PHASE_DONE_RESOLVING;
 
     // Check that a method just in the patch class is a target for a
     // typed selector.
     var selector = new Selector.call(
         buildSourceString('method'), compiler.coreLibrary, 0);
-    var typedSelector = new TypedSelector.exact(cls.rawType, selector);
+    var typedSelector = new TypedSelector.exact(cls, selector);
     Element method =
         cls.implementation.lookupLocalMember(buildSourceString('method'));
     Expect.isTrue(selector.applies(method, compiler));
     Expect.isTrue(typedSelector.applies(method, compiler));
 
     // Check that the declaration method in the declaration class is a target
     // for a typed selector.
     selector = new Selector.call(
         buildSourceString('clear'), compiler.coreLibrary, 0);
-    typedSelector = new TypedSelector.exact(cls.rawType, selector);
+    typedSelector = new TypedSelector.exact(cls, selector);
     method = cls.lookupLocalMember(buildSourceString('clear'));
     Expect.isTrue(selector.applies(method, compiler));
     Expect.isTrue(typedSelector.applies(method, compiler));
 
     // Check that the declaration method in the declaration class is a target
     // for a typed selector on a subclass.
     cls = ensure(compiler, "B", compiler.coreLibrary.find);
     cls.ensureResolved(compiler);
-    typedSelector = new TypedSelector.exact(cls.rawType, selector);
+    typedSelector = new TypedSelector.exact(cls, selector);
     Expect.isTrue(selector.applies(method, compiler));
     Expect.isTrue(typedSelector.applies(method, compiler));
   }));
 }
 
 void testAnalyzeAllInjectedMembers() {
   void expect(String patchText, [expectedWarnings]) {
     if (expectedWarnings == null) expectedWarnings = [];
     if (expectedWarnings is! List) {
       expectedWarnings = <MessageKind>[expectedWarnings];
@@ skipping 69 matching lines @@
   testPatchNoGetter();
   testPatchNonSetter();
   testPatchNoSetter();
   testPatchNonFunction();
 
   testPatchAndSelector();
 
   testAnalyzeAllInjectedMembers();
   testTypecheckPatchedMembers();
 }