Revert "dart2js: more uses of the model in the old emitter."

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 b0820443a763cd6a0833441ac9884cd3bed015fe..6a8381564379138dd1b8e1aed7cc4575122b3c6f 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
@@ -11,11 +11,12 @@ class ClassEmitter extends CodeEmitterHelper {
 
   /**
    * Documentation wanted -- johnniwinther
+   *
+   * Invariant: [classElement] must be a declaration element.
    */
-  void emitClass(Class cls,
-                 ClassBuilder enclosingBuilder,
-                 Map<String, jsAst.Expression> additionalProperties) {
-    ClassElement classElement = cls.element;
+  void generateClass(ClassElement classElement,
+                     ClassBuilder properties,
+                     Map<String, jsAst.Expression> additionalProperties) {
     final onlyForRti =
         emitter.typeTestRegistry.rtiNeededClasses.contains(classElement);
 
@@ -25,15 +26,14 @@ class ClassEmitter extends CodeEmitterHelper {
     emitter.needsClassSupport = true;
     String className = namer.getNameOfClass(classElement);
 
-    Class superclass = cls.superclass;
+    ClassElement superclass = classElement.superclass;
     String superName = "";
     if (superclass != null) {
-      superName = superclass.name;
+      superName = namer.getNameOfClass(superclass);
     }
 
-    if (cls.isMixinApplication) {
-      MixinApplication mixinApplication = cls;
-      String mixinName = mixinApplication.mixinClass.name;
+    if (classElement.isMixinApplication) {
+      String mixinName = namer.getNameOfClass(computeMixinClass(classElement));
       superName = '$superName+$mixinName';
       emitter.needsMixinSupport = true;
     }
@@ -60,7 +60,7 @@ class ClassEmitter extends CodeEmitterHelper {
     emitTypeVariableReaders(classElement, builder);
 
     emitClassBuilderWithReflectionData(
-        className, classElement, builder, enclosingBuilder);
+        className, classElement, builder, properties);
   }
 
   void emitClassConstructor(ClassElement classElement,