Use List instead of Link in the type system.

sdk/lib/_internal/compiler/implementation/js_backend/namer.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart b/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
index 1b79342173fb6dde7d83fd212840f190aa5287c5..982bc4467a8b6e843ee924da1ae813963db873d9 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
@@ -1368,38 +1368,32 @@ class FunctionTypeNamer extends DartTypeVisitor {
 
   visitFunctionType(FunctionType type, _) {
     if (backend.rti.isSimpleFunctionType(type)) {
-      sb.write('args${type.parameterTypes.slowLength()}');
+      sb.write('args${type.parameterTypes.length}');
       return;
     }
     visit(type.returnType);
     sb.write('_');
-    for (Link<DartType> link = type.parameterTypes;
-         !link.isEmpty;
-         link = link.tail) {
+    for (DartType parameter in type.parameterTypes) {
       sb.write('_');
-      visit(link.head);
+      visit(parameter);
     }
     bool first = false;
-    for (Link<DartType> link = type.optionalParameterTypes;
-         !link.isEmpty;
-         link = link.tail) {
+    for (DartType parameter in  type.optionalParameterTypes) {
       if (!first) {
         sb.write('_');
       }
       sb.write('_');
-      visit(link.head);
+      visit(parameter);
       first = true;
     }
     if (!type.namedParameterTypes.isEmpty) {
       first = false;
-      for (Link<DartType> link = type.namedParameterTypes;
-          !link.isEmpty;
-          link = link.tail) {
+      for (DartType parameter in type.namedParameterTypes) {
         if (!first) {
           sb.write('_');
         }
         sb.write('_');
-        visit(link.head);
+        visit(parameter);
         first = true;
       }
     }