Move computation of method flags into model.

pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
index 88c5f612ccc7a48d7846d4cbc7267212f3873774..f08b34102cfd8347ebbd47bc5fe84c23800de33c 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
@@ -236,16 +236,16 @@ class ClassEmitter extends CodeEmitterHelper {
 
     if (cls.onlyForRti || cls.isMixinApplication) return;
 
-    void visitMember(ClassElement enclosing, Element member) {
-      assert(invariant(classElement, member.isDeclaration));
-      if (member.isInstanceMember) {
-        emitter.containerBuilder.addMember(member, builder);
-      }
+    // TODO(herhut): This is a no-op. Should it be removed?
+    for (Field field in cls.fields) {
+      emitter.containerBuilder.addMemberField(field, builder);
     }
 
-    classElement.implementation.forEachMember(
-        visitMember,
-        includeBackendMembers: true);
+    for (Method method in cls.methods) {
+      assert(invariant(classElement, method.element.isDeclaration));
+      assert(invariant(classElement, method.element.isInstanceMember));
+      emitter.containerBuilder.addMemberMethod(method, builder);
+    }
 
     if (identical(classElement, compiler.objectClass)
         && compiler.enabledNoSuchMethod) {