Remove tracking of factories used with type arguments.

pkg/compiler/lib/src/enqueue.dart

Index: pkg/compiler/lib/src/enqueue.dart
diff --git a/pkg/compiler/lib/src/enqueue.dart b/pkg/compiler/lib/src/enqueue.dart
index 9d04cd1e6b89654f0d3299f3d8a19b463056777a..e00b7502307ec18991bc98417fd171974ca51c46 100644
--- a/pkg/compiler/lib/src/enqueue.dart
+++ b/pkg/compiler/lib/src/enqueue.dart
@@ -569,15 +569,6 @@ abstract class Enqueuer {
            !type.element.enclosingElement.isTypedef);
   }
 
-  /**
-   * 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(Registry registry) {
-    universe.usingFactoryWithTypeArguments = true;
-  }
-
   void registerCallMethodWithFreeTypeVariables(
       Element element,
       Registry registry) {