A bit of element model cleanup.

sdk/lib/_internal/compiler/implementation/resolution/registry.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 part of resolution;
 
 /// [ResolutionRegistry] collects all resolution information. It stores node
 /// related information in a [TreeElements] mapping and registers calls with
 /// [Backend], [World] and [Enqueuer].
 // TODO(johnniwinther): Split this into an interface and implementation class.
@@ skipping 209 matching lines @@
   void registerIsCheck(DartType type) {
     world.registerIsCheck(type, this);
     backend.resolutionCallbacks.onIsCheck(type, this);
   }
 
   void registerAsCheck(DartType type) {
     registerIsCheck(type);
     backend.resolutionCallbacks.onAsCheck(type, this);
   }
 
-  void registerClosure(Element element) {
+  void registerClosure(LocalFunctionElement element) {
     world.registerClosure(element, this);
   }
 
   void registerSuperUse(Node node) {
     mapping.superUses.add(node);
   }
 
   void registerDynamicInvocation(Selector selector) {
     world.registerDynamicInvocation(currentElement, selector);
   }
@@ skipping 114 matching lines @@
 
   void registerAssert(Send node) {
     mapping.setAssert(node);
     backend.resolutionCallbacks.onAssert(node, this);
   }
 
   bool isAssert(Send node) {
     return mapping.isAssert(node);
   }
 }