A bit of element model cleanup.

sdk/lib/_internal/compiler/implementation/js_emitter/container_builder.dart

 // Copyright (c) 2013, 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 dart2js.js_emitter;
 
 /// This class should morph into something that makes it easy to build
 /// JavaScript representations of libraries, class-sides, and instance-sides.
 /// Initially, it is just a placeholder for code that is moved from
 /// [CodeEmitterTask].
@@ skipping 62 matching lines @@
       parametersBuffer[0] = new jsAst.Parameter(receiverArgumentName);
       argumentsBuffer[0] = js('#', receiverArgumentName);
       task.interceptorEmitter.interceptorInvocationNames.add(invocationName);
     }
 
     int optionalParameterStart = positionalArgumentCount + extraArgumentCount;
     // Includes extra receiver argument when using interceptor convention
     int indexOfLastOptionalArgumentInParameters = optionalParameterStart - 1;
 
     int parameterIndex = 0;
-    parameters.orderedForEachParameter((Element element) {
+    parameters.orderedForEachParameter((ParameterElement element) {
       String jsName = backend.namer.safeName(element.name);
       assert(jsName != receiverArgumentName);
       if (count < optionalParameterStart) {
         parametersBuffer[count] = new jsAst.Parameter(jsName);
         argumentsBuffer[count] = js('#', jsName);
       } else {
         int index = names.indexOf(element.name);
         if (index != -1) {
           indexOfLastOptionalArgumentInParameters = count;
           // The order of the named arguments is not the same as the
@@ skipping 445 matching lines @@
     } else if (isClosure && canBeApplied) {
       expressions.add(js.string(member.name));
     }
     builder.addProperty(name, new jsAst.ArrayInitializer.from(expressions));
   }
 
   void addMemberField(VariableElement member, ClassBuilder builder) {
     // For now, do nothing.
   }
 }