Refactor Library/CompilationUnit and how we define local Scope.

lib/compiler/implementation/native_emitter.dart

Index: lib/compiler/implementation/native_emitter.dart
diff --git a/lib/compiler/implementation/native_emitter.dart b/lib/compiler/implementation/native_emitter.dart
index d2c38251314b9597450d9e73526053a869b47b8f..20aff607b20fe08fc785842236832f7c616fb689 100644
--- a/lib/compiler/implementation/native_emitter.dart
+++ b/lib/compiler/implementation/native_emitter.dart
@@ -112,7 +112,7 @@ function(cls, fields, methods) {
       nativeBuffer.add("$className.$name = $value;\n");
     }
 
-    for (Element member in classElement.members) {
+    for (Element member in classElement.localMembers) {
       if (member.isInstanceMember()) {
         emitter.addInstanceMember(member, defineInstanceMember);
       }