remove old way of collecting dependencies for dump-info

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library js_backend.backend;
 
 import 'dart:async' show Future;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
 
@@ skipping 2675 matching lines @@
   bool onQueueEmpty(Enqueuer enqueuer, Iterable<ClassEntity> recentClasses) {
     // TODO(johnniwinther): Avoid the need for accessing [_backend].
     return _backend._onQueueEmpty(enqueuer, recentClasses);
   }
 
   @override
   WorldImpact registerUsedElement(MemberElement member) {
     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;
   }
 
   WorldImpact registerClosureWithFreeTypeVariables(MethodElement closure) {
     if (methodNeedsRti(closure)) {
       return _registerComputeSignature();
     }
     return const WorldImpact();
   }
 
@@ skipping 15 matching lines @@
   WorldImpact registerInstantiatedClass(ClassEntity cls) {
     WorldImpact worldImpact = _processClass(cls, forResolution: false);
     lookupMapAnalysis.registerInstantiatedClass(cls);
     return worldImpact;
   }
 
   // TODO(johnniwinther): Avoid the need for accessing [_backend].
   bool methodNeedsRti(FunctionElement function) =>
       _backend.methodNeedsRti(function);
 }