Remove tracking of factories with type arguments.

sdk/lib/_internal/compiler/implementation/enqueue.dart

Index: sdk/lib/_internal/compiler/implementation/enqueue.dart
diff --git a/sdk/lib/_internal/compiler/implementation/enqueue.dart b/sdk/lib/_internal/compiler/implementation/enqueue.dart
index 986ebec06d94620ba6c28520e89836f9ea4b9e4a..599f018c5e9a9fb51f849a07574a97a15ec92955 100644
--- a/sdk/lib/_internal/compiler/implementation/enqueue.dart
+++ b/sdk/lib/_internal/compiler/implementation/enqueue.dart
@@ -495,15 +495,6 @@ abstract class Enqueuer {
     compiler.backend.registerIsCheck(type, this, elements);
   }
 
-  /**
-   * If a factory constructor is used with type arguments, we lose track
-   * which arguments could be used to create instances of classes that use their
-   * type variables as expressions, so we have to remember if we saw such a use.
-   */
-  void registerFactoryWithTypeArguments(TreeElements elements) {
-    universe.usingFactoryWithTypeArguments = true;
-  }
-
   void registerAsCheck(DartType type, TreeElements elements) {
     registerIsCheck(type, elements);
     compiler.backend.registerAsCheck(type, this, elements);