Some linked_ptr -> unique_ptr conversion in extensions/browser.

chrome/browser/chromeos/extensions/file_manager/event_router.cc

 // Copyright 2014 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/chromeos/extensions/file_manager/event_router.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 324 matching lines @@
   std::set<std::string> GetFileTransfersUpdateEventListenerExtensionIds()
       override {
     const extensions::EventListenerMap::ListenerList& listeners =
         extensions::EventRouter::Get(profile_)
             ->listeners()
             .GetEventListenersByName(
                 file_manager_private::OnFileTransfersUpdated::kEventName);
 
     std::set<std::string> extension_ids;
 
-    for (const auto listener : listeners) {
+    for (const auto& listener : listeners) {
       extension_ids.insert(listener->extension_id());
     }
 
     return extension_ids;
   }
 
   GURL ConvertDrivePathToFileSystemUrl(
       const base::FilePath& file_path,
       const std::string& extension_id) override {
     return file_manager::util::ConvertDrivePathToFileSystemUrl(
@@ skipping 621 matching lines @@
 void EventRouter::SetDispatchDirectoryChangeEventImplForTesting(
     const DispatchDirectoryChangeEventImplCallback& callback) {
   dispatch_directory_change_event_impl_ = callback;
 }
 
 base::WeakPtr<EventRouter> EventRouter::GetWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }
 
 }  // namespace file_manager