Revert of Remove stl_util's deletion function use from components/invalidation/.

components/invalidation/impl/sync_system_resources.h

Index: components/invalidation/impl/sync_system_resources.h
diff --git a/components/invalidation/impl/sync_system_resources.h b/components/invalidation/impl/sync_system_resources.h
index beb827b2c241e46f2a0a48acbcc15d052bc1aa0a..9ba126be14bded86f15312b68f155d24a7abe8bf 100644
--- a/components/invalidation/impl/sync_system_resources.h
+++ b/components/invalidation/impl/sync_system_resources.h
@@ -70,7 +70,7 @@
   void RunPostedTask(invalidation::Closure* task);
 
   // Holds all posted tasks that have not yet been run.
-  std::set<std::unique_ptr<invalidation::Closure>> posted_tasks_;
+  std::set<invalidation::Closure*> posted_tasks_;
 
   scoped_refptr<base::SingleThreadTaskRunner> const created_on_task_runner_;
   bool is_started_;
@@ -159,10 +159,12 @@
   bool DeliverIncomingMessage(const std::string& message);
 
  private:
+  typedef std::vector<invalidation::NetworkStatusCallback*>
+      NetworkStatusReceiverList;
+
   // Callbacks into invalidation library
   std::unique_ptr<invalidation::MessageCallback> incoming_receiver_;
-  std::vector<std::unique_ptr<invalidation::NetworkStatusCallback>>
-      network_status_receivers_;
+  NetworkStatusReceiverList network_status_receivers_;
 
   // Last network status for new network status receivers.
   bool last_network_status_;