Remove js.ArrayElement.

tests/compiler/dart2js/js_parser_statements_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 'dart:async';
 import 'package:expect/expect.dart';
 import 'package:async_helper/async_helper.dart';
 import 'mock_compiler.dart';
 import 'package:compiler/src/js/js.dart' as jsAst;
 import 'package:compiler/src/js/js.dart' show js;
@@ skipping 182 matching lines @@
     testStatement('function foo(#){}', [['x', 'y']], 'function foo(x, y) {\n}'),
     testStatement('function foo(#a){}', {'a': new jsAst.Parameter('x')},
         'function foo(x) {\n}'),
     testStatement('function foo(#a){}', {'a': 'x'}, 'function foo(x) {\n}'),
     testStatement('function foo(#a){}', {'a': []}, 'function foo() {\n}'),
     testStatement('function foo(#a){}', {'a': ['x']}, 'function foo(x) {\n}'),
     testStatement('function foo(#a){}',
                   {'a': ['x', 'y']},
                   'function foo(x, y) {\n}'),
 
-
     testStatement('a = #.#', [eVar,eOne], 'a = x[1];'),
     testStatement('a = #.#', [eVar,'foo'], 'a = x.foo;'),
     testStatement('a = #a.#b', {'a': eVar, 'b': eOne}, 'a = x[1];'),
     testStatement('a = #a.#b', {'a': eVar, 'b': 'foo'}, 'a = x.foo;'),
 
     testStatement('function f(#) { return #.#; }', ['x', eVar,'foo'],
         'function f(x) {\n  return x.foo;\n}'),
     testStatement('function f(#a) { return #b.#c; }',
                   {'a': 'x', 'b': eVar, 'c': 'foo'},
                   'function f(x) {\n  return x.foo;\n}'),
@@ skipping 42 matching lines @@
     testStatement('#a.prototype.#a = function(#b) { return #c.#c };',
                   {'a': 'name1_2',
                    'b': ['r', 'y'],
                    'c': 'name4_5'},
                   'name1_2.prototype.name1_2 = function(r, y) {\n'
                   '  return name4_5.name4_5;\n'
                   '};'),
 
   ]));
 }