Some linked_ptr -> unique_ptr conversion in extensions/browser.

chrome/browser/extensions/api/bluetooth_low_energy/bluetooth_low_energy_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/extensions/api/bluetooth_low_energy/bluetooth_low_energy_event_router.h"
 
 #include <algorithm>
 #include <iterator>
 #include <utility>
 
@@ skipping 1457 matching lines @@
     const std::string& event_name,
     const device::BluetoothUUID& uuid,
     const std::string& characteristic_id,
     std::unique_ptr<base::ListValue> args) {
   // Obtain the listeners of |event_name|. The list can contain multiple
   // entries for the same extension, so we keep track of the extensions that we
   // already sent the event to, since we want the send an event to an extension
   // only once.
   BluetoothPermissionRequest request(uuid.value());
   std::set<std::string> handled_extensions;
-  const EventListenerMap::ListenerList listeners =
-      EventRouter::Get(browser_context_)->listeners().GetEventListenersByName(
-          event_name);
+  const EventListenerMap::ListenerList& listeners =
+      EventRouter::Get(browser_context_)
+          ->listeners()
+          .GetEventListenersByName(event_name);
 
-  for (EventListenerMap::ListenerList::const_iterator iter = listeners.begin();
-       iter != listeners.end();
-       ++iter) {
-    const std::string extension_id = (*iter)->extension_id();
+  for (const std::unique_ptr<EventListener>& listener : listeners) {
+    const std::string extension_id = listener->extension_id();

[Devlin, 2016/08/30 19:21:53]

can this be const&?

[lazyboy, 2016/08/30 20:30:56]

Done.

     if (handled_extensions.find(extension_id) != handled_extensions.end())
       continue;
 
     handled_extensions.insert(extension_id);
 
     const Extension* extension =
         ExtensionRegistry::Get(browser_context_)
             ->GetExtensionById(extension_id, ExtensionRegistry::EVERYTHING);
 
     // For all API methods, the "low_energy" permission check is handled by
@@ skipping 424 matching lines @@
     requests_[extension_id] = std::move(new_request_id_map);
   } else {
     request_id_map = iter->second.get();
   }
 
   (*request_id_map)[++last_callback_request_id_] = std::move(request);
   return last_callback_request_id_;
 }
 
 }  // namespace extensions