remove old way of collecting dependencies for dump-info

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

Index: pkg/compiler/lib/src/js_backend/backend.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend.dart b/pkg/compiler/lib/src/js_backend/backend.dart
index c8c6c8363db4d465ec7cdc5bcdcc945f72d054b4..7ffcc12e4d0ef0b46f818d0b29d1c66bdddb2566 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -2693,10 +2693,6 @@ class CodegenEnqueuerListener extends EnqueuerListenerBase {
     WorldImpactBuilderImpl worldImpact = new WorldImpactBuilderImpl();
     _registerUsedElement(worldImpact, member, forResolution: false);
 
-    // TODO(sigmund): add other missing dependencies (internals, selectors
-    // enqueued after allocations).
-    dumpInfoTask.registerDependency(member);
-
     return worldImpact;
   }