Revert "dart2js: Refactoring, documentation, and a few bugfixes in Namer class."

tests/language/named_parameter_clash_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.
-
-import 'package:expect/expect.dart';
-
-class Foo {
-  m({a, b, c}) {
-    try {} catch(e) {} // no inline
-    return 'Foo $a $b $c';
-  }
-}
-
-class Bar {
-  m(z, {a$b, c}) {
-    try {} catch(e) {} // no inline
-    var ab = a$b;
-    return 'Bar $z $ab $c';
-  }
-}
-
-inscrutable(xs, i) => i == 0 ? xs[0] : inscrutable(xs.sublist(1), i-1);
-
-main() {
-  var list = [new Foo(), new Bar()];
-  var foo = inscrutable(list, 0);
-  var bar = inscrutable(list, 1);
-
-  Expect.equals(r'Foo a b c',   foo.m(a: 'a', b: 'b', c: 'c'));
-  Expect.equals(r'Bar z a$b c', bar.m('z', a$b: r'a$b', c: 'c'));
-
-  Expect.throws(() => foo.m('z', a$b: r'a$b', c: 'c'), 
-                (e) => e is NoSuchMethodError);
-  Expect.throws(() => bar.m(a: 'a', b: 'b', c: 'c'),
-                (e) => e is NoSuchMethodError);
-}