Remove use of FunctionSignature et al from call_structure.dart

pkg/compiler/lib/src/resolution/class_hierarchy.dart

Index: pkg/compiler/lib/src/resolution/class_hierarchy.dart
diff --git a/pkg/compiler/lib/src/resolution/class_hierarchy.dart b/pkg/compiler/lib/src/resolution/class_hierarchy.dart
index a63a09327651d85c4adfb84a71b342c396da4539..2544cb4b0d49c3a15bbf785ef957bd9abebee754 100644
--- a/pkg/compiler/lib/src/resolution/class_hierarchy.dart
+++ b/pkg/compiler/lib/src/resolution/class_hierarchy.dart
@@ -202,8 +202,7 @@ class ClassResolverVisitor extends TypeDefinitionVisitor {
       } else {
         ConstructorElement superConstructor = superMember;
         superConstructor.computeType(resolution);
-        if (!CallStructure.NO_ARGS
-            .signatureApplies(superConstructor.functionSignature)) {
+        if (!CallStructure.NO_ARGS.signatureApplies(superConstructor.type)) {
           MessageKind kind = MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT;
           reporter.reportErrorMessage(node, kind);
           superMember = new ErroneousElementX(kind, {}, '', element);