Fix function type parameter parsing

tests/language/function_type_parameter_test.dart

Index: tests/language/function_type_parameter_test.dart
===================================================================
--- tests/language/function_type_parameter_test.dart	(revision 27677)
+++ tests/language/function_type_parameter_test.dart	(working copy)
@@ -10,6 +10,7 @@
 class A {
   final f;
   A(int this.f());
+  const A.nother(int this.f());
 
   static Function func;
 
@@ -28,4 +29,5 @@
   Expect.equals(null, A.func);
 
   Expect.equals(42, new A(() => 42).f());
+  Expect.equals(42, new A.nother(() => 42).f());
 }