Change Link to List in FunctionSignature.

tests/compiler/dart2js/type_equals_test.dart

Index: tests/compiler/dart2js/type_equals_test.dart
diff --git a/tests/compiler/dart2js/type_equals_test.dart b/tests/compiler/dart2js/type_equals_test.dart
index 2d01b361d8dc885056d77c740464ba720995043c..16e1066e89c813badc23bbcfb32a0248ca6bdcc5 100644
--- a/tests/compiler/dart2js/type_equals_test.dart
+++ b/tests/compiler/dart2js/type_equals_test.dart
@@ -34,14 +34,14 @@ bool test(compiler, String name1, String name2, {bool expect}) {
     type1 = signature1.type.returnType;
   } else {
     // Otherwise use the first argument type.
-    type1 = signature1.requiredParameters.head.computeType(compiler);
+    type1 = signature1.requiredParameters.first.type;
   }
   if (signature2.requiredParameterCount == 0) {
     // If parameters is empty, use return type.
     type2 = signature2.type.returnType;
   } else {
     // Otherwise use the first argument type.
-    type2 = signature2.requiredParameters.head.computeType(compiler);
+    type2 = signature2.requiredParameters.first.type;
   }
   if (expect) {
     Expect.equals(type1, type2, "$type1 != $type2");