Convert //components/policy from scoped_ptr to std::unique_ptr

components/policy/core/common/external_data_fetcher.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/policy/core/common/external_data_fetcher.h"
 
 #include "base/callback.h"
 #include "components/policy/core/common/external_data_manager.h"
 
 namespace policy {
@@ skipping 21 matching lines @@
   if (!first || !second)
     return false;
   return first->manager_.get() == second->manager_.get() &&
          first->policy_ == second->policy_;
 }
 
 void ExternalDataFetcher::Fetch(const FetchCallback& callback) const {
   if (manager_)
     manager_->Fetch(policy_, callback);
   else
-    callback.Run(scoped_ptr<std::string>());
+    callback.Run(std::unique_ptr<std::string>());
 }
 
 }  // namespace policy