Remove implicit dependencies.

dart/pkg/compiler/lib/src/dart_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.
 
 part of dart_backend;
 
 // TODO(ahe): This class is simply wrong.  This backend should use
 // elements when it can, not AST nodes.  Perhaps a [Map<Element,
 // TreeElements>] is what is needed.
 class ElementAst {
@@ skipping 352 matching lines @@
               } else {
                 registry.registerDynamicInvocation(selector);
               }
             });
           }
         }
       }
     }
 
   }
+
+  void registerMainHasArguments(Enqueuer enqueuer) {
+    // The first argument could be a list of strings.
+    enqueuer.registerInstantiatedClass(
+        listImplementation, compiler.globalDependencies);
+    enqueuer.registerInstantiatedClass(
+        stringImplementation, compiler.globalDependencies);
+  }
 }
 
 class DartResolutionCallbacks extends ResolutionCallbacks {
   final DartBackend backend;
 
   DartResolutionCallbacks(this.backend);
 
   void onTypeLiteral(DartType type, Registry registry) {
     if (type.isInterfaceType) {
       backend.usedTypeLiterals.add(type.element);
@@ skipping 158 matching lines @@
   }
 
   void traceGraph(String title, var irObject) {
     compiler.tracer.traceGraph(title, irObject);
   }
 
   DartTypes get dartTypes => compiler.types;
 
   InternalErrorFunction get internalError => compiler.internalError;
 }