Cleanup registration of closures

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

Index: pkg/compiler/lib/src/js_backend/codegen_listener.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen_listener.dart b/pkg/compiler/lib/src/js_backend/codegen_listener.dart
index e2a438870b27f7506dd600c7c438b133e0027745..30f1ddc6ed9ea9ccd50fd3c40e30446a2234f9a4 100644
--- a/pkg/compiler/lib/src/js_backend/codegen_listener.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen_listener.dart
@@ -60,8 +60,15 @@ class CodegenEnqueuerListener extends EnqueuerListener {
   BackendUsage get _backendUsage => _backend.backendUsage;
 
   @override
-  WorldImpact registerBoundClosure() {
-    return _impacts.memberClosure.createImpact(_elementEnvironment);
+  WorldImpact registerClosurizedMember(MemberElement element) {
+    WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
+    impactBuilder
+        .addImpact(_impacts.memberClosure.createImpact(_elementEnvironment));
+    if (element.type.containsTypeVariables &&
+        _rtiNeed.methodNeedsRti(element)) {
+      impactBuilder.addImpact(_registerComputeSignature());
+    }
+    return impactBuilder;
   }
 
   @override
@@ -177,13 +184,6 @@ class CodegenEnqueuerListener extends EnqueuerListener {
     return worldImpact;
   }
 
-  WorldImpact registerClosureWithFreeTypeVariables(MethodElement closure) {
-    if (_rtiNeed.methodNeedsRti(closure)) {
-      return _registerComputeSignature();
-    }
-    return const WorldImpact();
-  }
-
   WorldImpact _processClass(ClassElement cls) {
     WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
     if (!cls.typeVariables.isEmpty) {