remove ClosureWrap option and related implementation

test/checker/checker_test.dart

 // Copyright (c) 2015, 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.
 
 /// General type checking tests
 library dev_compiler.test.checker_test;
 
 import 'package:test/test.dart';
 
 import 'package:dev_compiler/src/testing.dart';
@@ skipping 1053 matching lines @@
       '/main.dart': '''
 
       class A {
         void bar() => null;
         void foo() => bar; // allowed
       }
    '''
     });
   });
 
-  test('Closure wrapping of literals', () {
-    testChecker({
-      '/main.dart': '''
-      typedef T F<T>(T t1, T t2);
-      typedef dynamic D(t1, t2);
-
-      void main() {
-        F f1 = (x, y) => /*info:DynamicInvoke*/x + y;
-        F<int> f2 = /*warning:ClosureWrapLiteral*/(x, y) => /*info:DynamicInvoke*/x + y;
-        D f3 = (x, y) => /*info:DynamicInvoke*/x + y;
-        Function f4 = (x, y) => /*info:DynamicInvoke*/x + y;
-        f2 = /*warning:ClosureWrap*/f1;
-        f1 = (int x, int y) => x + y;
-        f2 = /*severe:StaticTypeError*/(int x) => -x;
-      }
-   '''
-    }, wrapClosures: true, inferDownwards: false);
-  });
-
   test('Generic subtyping: invariance', () {
     testChecker({
       '/main.dart': '''
 
       class A {}
       class B extends A {}
       class C implements A {}
 
       class L<T> {}
       class M<T> extends L<T> {}
@@ skipping 1925 matching lines @@
     '/main.dart': '''
       import 'dart:foobar' show Baz;
       main() {
         print(Baz.quux);
       }'''
   },
       customUrlMappings: {
     'dart:foobar': '$testDirectory/checker/dart_foobar.dart'
   }));
 }