Remove use of FunctionSignature et al from call_structure.dart

pkg/compiler/lib/src/inferrer/closure_tracer.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.
 
 library compiler.src.inferrer.closure_tracer;
 
 import '../common/names.dart' show Names;
 import '../elements/elements.dart';
 import '../js_backend/backend_helpers.dart';
 import '../types/types.dart' show TypeMask;
@@ skipping 35 matching lines @@
   }
 
   void _registerCallForLaterAnalysis(CallSiteTypeInformation info) {
     _callsToAnalyze.add(info);
   }
 
   void _analyzeCall(CallSiteTypeInformation info) {
     Selector selector = info.selector;
     TypeMask mask = info.mask;
     tracedElements.forEach((FunctionElement functionElement) {
-      if (!selector.callStructure
-          .signatureApplies(functionElement.functionSignature)) {
+      if (!selector.callStructure.signatureApplies(functionElement.type)) {
         return;
       }
       inferrer.updateParameterAssignments(
           info, functionElement, info.arguments, selector, mask,
           remove: false, addToQueue: false);
     });
   }
 
   @override
   visitClosureCallSiteTypeInformation(ClosureCallSiteTypeInformation info) {
@@ skipping 65 matching lines @@
   @override
   visitStaticCallSiteTypeInformation(StaticCallSiteTypeInformation info) {
     super.visitStaticCallSiteTypeInformation(info);
     if (info.calledElement == tracedElements.first &&
         info.selector != null &&
         info.selector.isGetter) {
       addNewEscapeInformation(info);
     }
   }
 }