Revert "Infer types for compile-time constant closures."

tests/compiler/dart2js/simple_inferrer_const_closure2_test.dart

-// Copyright (c) 2014, 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 "package:async_helper/async_helper.dart";
-import 'compiler_helper.dart';
-
-const String TEST = """
-
-method(a) {  // Called via [foo] with integer then double.
-  return a;
-}
-
-const foo = method;
-
-returnNum(x) {
-  return foo(x);
-}
-
-main() {
-  returnNum(10);
-  returnNum(10.5);
-}
-""";
-
-
-void main() {
-  Uri uri = new Uri(scheme: 'source');
-  var compiler = compilerFor(TEST, uri);
-  asyncTest(() => compiler.runCompiler(uri).then((_) {
-    var typesInferrer = compiler.typesTask.typesInferrer;
-
-    checkReturn(String name, type) {
-      var element = findElement(compiler, name);
-      Expect.equals(type,
-          typesInferrer.getReturnTypeOfElement(element).simplify(compiler),
-          name);
-    }
-
-    checkReturn('method', compiler.typesTask.numType);
-    checkReturn('returnNum', compiler.typesTask.numType);
-  }));
-}