Revert "Implement call operator."

lib/compiler/implementation/typechecker.dart

Index: lib/compiler/implementation/typechecker.dart
diff --git a/lib/compiler/implementation/typechecker.dart b/lib/compiler/implementation/typechecker.dart
index 290b68a73e5f58d783a688d94943537d26df3484..9344d233a888ae4952a10597793b9728a97218d7 100644
--- a/lib/compiler/implementation/typechecker.dart
+++ b/lib/compiler/implementation/typechecker.dart
@@ -421,9 +421,7 @@ class TypeCheckerVisitor implements Visitor<Type> {
   }
 
   Type visitSend(Send node) {
-    Element element = elements[node];
-
-    if (Elements.isClosureSend(node, element)) {
+    if (Elements.isClosureSend(node, elements)) {
       // TODO(karlklose): Finish implementation.
       return types.dynamicType;
     }
@@ -466,6 +464,7 @@ class TypeCheckerVisitor implements Visitor<Type> {
         // TODO(karlklose): we cannot handle fields.
         return unhandledExpression();
       }
+      Element element = elements[node];
       if (element === null) return types.dynamicType;
       return computeType(element);
 
@@ -503,6 +502,7 @@ class TypeCheckerVisitor implements Visitor<Type> {
           if (memberType.element === compiler.dynamicClass) return null;
           return memberType;
         } else {
+          Element element = elements[node];
           if (element === null) {
             fail(node, 'unresolved ${node.selector}');
           } else if (element.kind === ElementKind.FUNCTION) {