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

tests/language/constructor_name_clash_test.dart

Index: tests/language/constructor_name_clash_test.dart
diff --git a/tests/language/regress_21998_1_test.dart b/tests/language/constructor_name_clash_test.dart
similarity index 59%
copy from tests/language/regress_21998_1_test.dart
copy to tests/language/constructor_name_clash_test.dart
index 3237f3396629f6fd11270e1adc290bec78713958..80273ccba7c48650d085b46c243e52b6fb520446 100644
--- a/tests/language/regress_21998_1_test.dart
+++ b/tests/language/constructor_name_clash_test.dart
@@ -2,17 +2,17 @@
 // 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:math' as Math;
 import 'package:expect/expect.dart';
+import 'constructor_name_clash_lib.dart' as lib;
 
-main() {
-  Expect.equals(4, new C().m());
+class A extends lib.A {
+  A() {
+    lib.global += 100;
+    try {} catch(e) {} // no inline
+  }
 }
 
-class C {
-  max(a) => a;
-
-  m() {
-    return max(Math.max(2, 4));
-  }
-}
+main() {
+  new A();
+  Expect.equals(110, lib.global);
+}