Revert two Kernel changes that were causing test failures.

pkg/kernel/lib/verifier.dart

 // Copyright (c) 2016, 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 kernel.checks;
 
 import 'ast.dart';
 import 'transformations/flags.dart';
 
 void verifyProgram(Program program) {
   VerifyingVisitor.check(program);
@@ skipping 319 matching lines @@
 
   visitVariableDeclaration(VariableDeclaration node) {
     var parent = node.parent;
     if (parent is! Block &&
         !(parent is Catch && parent.body != node) &&
         !(parent is FunctionNode && parent.body != node) &&
         parent is! FunctionDeclaration &&
         !(parent is ForStatement && parent.body != node) &&
         !(parent is ForInStatement && parent.body != node) &&
         parent is! Let &&
-        parent is! LocalInitializer &&
-        parent is! Typedef) {
+        parent is! LocalInitializer) {
       problem(
           node,
           "VariableDeclaration must be a direct child of a Block, "
           "not ${parent.runtimeType}.");
     }
     visitChildren(node);
     declareVariable(node);
   }
 
   visitVariableGet(VariableGet node) {
@@ skipping 250 matching lines @@
     var oldParent = parent;
     parent = node;
     node.visitChildren(this);
     parent = oldParent;
   }
 }
 
 void checkInitializers(Constructor constructor) {
   // TODO(ahe): I'll add more here in other CLs.
 }