Revert "Add support for the new function-type syntax."

tests/compiler/dart2js/resolver_test.dart

 // Copyright (c) 2012, 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.
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:compiler/src/constants/expressions.dart';
@@ skipping 131 matching lines @@
     }),
   ]);
 }
 
 Future testTypeVariables() {
   matchResolvedTypes(visitor, text, name, expectedElements) {
     VariableDefinitions definition = parseStatement(text);
     visitor.visit(definition.type);
     ResolutionInterfaceType type =
         visitor.registry.mapping.getType(definition.type);
-    NominalTypeAnnotation annotation = definition.type;
     Expect.equals(
-        annotation.typeArguments.slowLength(), type.typeArguments.length);
+        definition.type.typeArguments.slowLength(), type.typeArguments.length);
     int index = 0;
     for (ResolutionDartType argument in type.typeArguments) {
       Expect.equals(true, index < expectedElements.length);
       Expect.equals(expectedElements[index], argument.element);
       index++;
     }
     Expect.equals(index, expectedElements.length);
   }
 
   return Future.wait([
@@ skipping 529 matching lines @@
   });
 }
 
 Future testTopLevelFields() {
   return MockCompiler.create((MockCompiler compiler) {
     compiler.parseScript("int a;");
     VariableElementX element = compiler.mainApp.find("a");
     Expect.equals(ElementKind.FIELD, element.kind);
     VariableDefinitions node =
         element.variables.parseNode(element, compiler.parsingContext);
-    NominalTypeAnnotation annotation = node.type;
-    Identifier typeName = annotation.typeName;
+    Identifier typeName = node.type.typeName;
     Expect.equals(typeName.source, 'int');
 
     compiler.parseScript("var b, c;");
     VariableElementX bElement = compiler.mainApp.find("b");
     VariableElementX cElement = compiler.mainApp.find("c");
     Expect.equals(ElementKind.FIELD, bElement.kind);
     Expect.equals(ElementKind.FIELD, cElement.kind);
     Expect.isTrue(bElement != cElement);
 
     VariableDefinitions bNode =
@@ skipping 823 matching lines @@
       functionName: 'm');
   check(
       '''
     class A {
       m() => () => await - 3;
     }
     main() => new A().m();
   ''',
       className: 'A');
 }