Some linked_ptr -> unique_ptr conversion in extensions/browser.

chrome/browser/extensions/api/easy_unlock_private/easy_unlock_private_connection_manager.cc

 // Copyright 2015 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 "chrome/browser/extensions/api/easy_unlock_private/easy_unlock_private_connection_manager.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 135 matching lines @@
       api::easy_unlock_private::OnSendCompleted::Create(0, data, success);
   DispatchConnectionEvent(event_name, histogram_value, &connection,
                           std::move(args));
 }
 
 void EasyUnlockPrivateConnectionManager::DispatchConnectionEvent(
     const std::string& event_name,
     events::HistogramValue histogram_value,
     const Connection* connection,
     std::unique_ptr<base::ListValue> args) {
-  const EventListenerMap::ListenerList listeners =
+  const EventListenerMap::ListenerList& listeners =
       EventRouter::Get(browser_context_)
           ->listeners()
           .GetEventListenersByName(event_name);
   for (const auto& listener : listeners) {
     std::string extension_id = listener->extension_id();
     int connection_id = FindConnectionId(extension_id, connection);
     std::unique_ptr<base::ListValue> args_copy(args->DeepCopy());
     int connection_index = 0;
     args_copy->Set(connection_index,
                    base::MakeUnique<base::FundamentalValue>(connection_id));
@@ skipping 28 matching lines @@
   base::hash_set<int>* connection_ids =
       GetResourceManager()->GetResourceIds(extension_id);
   for (int connection_id : *connection_ids) {
     if (connection == GetConnection(extension_id, connection_id))
       return connection_id;
   }
   return 0;
 }
 
 }  // namespace extensions