Use List instead of Link in the type system.

sdk/lib/_internal/compiler/implementation/dart_backend/renamer.dart

Index: sdk/lib/_internal/compiler/implementation/dart_backend/renamer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/dart_backend/renamer.dart b/sdk/lib/_internal/compiler/implementation/dart_backend/renamer.dart
index 7ab927d5acec9e2f2c9a17ba38de567a32c857e4..108d6e17243199361df0be01d54f0e2a2264ba5d 100644
--- a/sdk/lib/_internal/compiler/implementation/dart_backend/renamer.dart
+++ b/sdk/lib/_internal/compiler/implementation/dart_backend/renamer.dart
@@ -92,12 +92,11 @@ void renamePlaceholders(
     StringBuffer result = new StringBuffer(renameElement(type.element));
     if (type is GenericType && !type.treatAsRaw) {
       result.write('<');
-      Link<DartType> argumentsLink = type.typeArguments;
-      result.write(renameType(argumentsLink.head, renameElement));
-      for (Link<DartType> link = argumentsLink.tail; !link.isEmpty;
-           link = link.tail) {
+      List<DartType> arguments = type.typeArguments;
+      result.write(renameType(arguments.first, renameElement));
+      for (int index = 1; index < arguments.length; index++) {
         result.write(',');
-        result.write(renameType(link.head, renameElement));
+        result.write(renameType(arguments[index], renameElement));
       }
       result.write('>');
     }