Cleanup registration of closures

pkg/compiler/lib/src/js_backend/resolution_listener.dart

Index: pkg/compiler/lib/src/js_backend/resolution_listener.dart
diff --git a/pkg/compiler/lib/src/js_backend/resolution_listener.dart b/pkg/compiler/lib/src/js_backend/resolution_listener.dart
index 1f2f06423476dc84d2b9c6db1994643428e24aff..4ad08c5bc566525373ebebf3fd6c7850d92c505e 100644
--- a/pkg/compiler/lib/src/js_backend/resolution_listener.dart
+++ b/pkg/compiler/lib/src/js_backend/resolution_listener.dart
@@ -94,9 +94,15 @@ class ResolutionEnqueuerListener extends EnqueuerListener {
   }
 
   @override
-  WorldImpact registerBoundClosure() {
+  WorldImpact registerClosurizedMember(MemberElement element) {
+    WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
     _backendUsage.processBackendImpact(_impacts.memberClosure);
-    return _impacts.memberClosure.createImpact(_elementEnvironment);
+    impactBuilder
+        .addImpact(_impacts.memberClosure.createImpact(_elementEnvironment));
+    if (element.type.containsTypeVariables) {
+      impactBuilder.addImpact(_registerComputeSignature());
+    }
+    return impactBuilder;
   }
 
   @override
@@ -278,10 +284,6 @@ class ResolutionEnqueuerListener extends EnqueuerListener {
     return _impacts.runtimeTypeSupport.createImpact(_elementEnvironment);
   }
 
-  WorldImpact registerClosureWithFreeTypeVariables(MemberEntity closure) {
-    return _registerComputeSignature();
-  }
-
   WorldImpact _processClass(ClassElement cls) {
     WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
     if (!cls.typeVariables.isEmpty) {