Fix crash in dart2js on type literal sends.

sdk/lib/_internal/compiler/implementation/inferrer/inferrer_visitor.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 inferrer_visitor;
 
 import '../dart2jslib.dart' hide Selector, TypedSelector;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../tree/tree.dart';
@@ skipping 674 matching lines @@
   }
 
   T visitLiteralSymbol(LiteralSymbol node) {
     // TODO(kasperl): We should be able to tell that the type of a literal
     // symbol is always a non-null exact symbol implementation -- not just
     // any non-null subtype of the symbol interface.
     return types.nonNullSubtype(compiler.symbolClass);
   }
 
   T visitTypeReferenceSend(Send node) {
-    // If [node] is not a type literal is the class name of a static access,
-    // in which case we don't use the type mask.
-    return elements.isTypeLiteral(node) ? types.typeType : null;
+    return elements.isTypeLiteral(node) ? types.typeType : types.dynamicType;
   }
 
   bool isThisOrSuper(Node node) => node.isThis() || node.isSuper();
 
   Element get outermostElement {
     return
         analyzedElement.getOutermostEnclosingMemberOrTopLevel().implementation;
   }
 
   T _thisType;
@@ skipping 438 matching lines @@
     return type;
   }
 
   T visitCascade(Cascade node) {
     // Ignore the result of the cascade send and return the type of the cascade
     // receiver.
     visit(node.expression);
     return cascadeReceiverStack.removeLast();
   }
 }