Update inferrer test after r24138.

tests/compiler/dart2js/simple_inferrer_no_such_method_test.dart

 // Copyright (c) 2013, 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 'package:expect/expect.dart';
 
 import 'compiler_helper.dart';
 import 'parser_helper.dart';
 
 const String TEST1 = """
@@ skipping 90 matching lines @@
 
   checkReturn(String name, type) {
     var element = findElement(compiler, name);
     Expect.equals(
         type,
         typesInferrer.internal.returnTypeOf[element].simplify(compiler),
         name);
   }
 
   checkReturn('test1', typesInferrer.intType);
-  checkReturn('test2', typesInferrer.dynamicType);
+  checkReturn('test2', typesInferrer.dynamicType.nonNullable());
   checkReturn('test3', typesInferrer.intType);
   checkReturn('test4', typesInferrer.mapType);
   checkReturn('test5', typesInferrer.dynamicType.nonNullable());
   checkReturn('test6', typesInferrer.dynamicType.nonNullable());
 
   compiler = compilerFor(TEST2, uri);
   compiler.runCompiler(uri);
   typesInferrer = compiler.typesTask.typesInferrer;
 
-  checkReturn('test1', typesInferrer.dynamicType);
+  checkReturn('test1', typesInferrer.dynamicType.nonNullable());
   checkReturn('test2', typesInferrer.mapType);
   checkReturn('test3', typesInferrer.mapType);
   checkReturn('test4', typesInferrer.mapType);
   checkReturn('test5', typesInferrer.mapType);
 
-  // TODO(ngeoffray): The reason for nullablity is because the
-  // inferrer thinks Object.noSuchMethod return null. Once we track
-  // aborting control flow in the analysis, we won't get the nullable
-  // anymore.
-  checkReturn('test6', typesInferrer.numType.nullable());
+  checkReturn('test6', typesInferrer.numType);
   checkReturn('test7', typesInferrer.intType);
   checkReturn('test8', typesInferrer.intType);
   checkReturn('test9', typesInferrer.intType);
   checkReturn('test10', typesInferrer.numType);
   checkReturn('test11', typesInferrer.doubleType);
 }