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

pkg/compiler/lib/src/js_emitter/new_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/new_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/new_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/new_emitter/emitter.dart
index a543208cb2a1265976f8a1e35b15227dbc561618..a9c25bf057f8706b3a37daae7492b746bde62e63 100644
--- a/pkg/compiler/lib/src/js_emitter/new_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/new_emitter/emitter.dart
@@ -85,7 +85,7 @@ class Emitter implements emitterTask.Emitter {
   }
 
   js.PropertyAccess _globalPropertyAccess(Element element) {
-     String name = namer.getNameX(element);
+     String name = namer.globalPropertyName(element);
      js.PropertyAccess pa = new js.PropertyAccess.field(
          new js.VariableUse(namer.globalObjectFor(element)),
          name);