Remove some linked_ptr c/b/extension

chrome/browser/extensions/api/settings_private/settings_private_event_router.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/settings_private/settings_private_event_router.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 76 matching lines @@
   EventRouter* event_router = EventRouter::Get(context_);
   bool should_listen = event_router->HasEventListener(
       api::settings_private::OnPrefsChanged::kEventName);
 
   if (should_listen && !listening_) {
     const PrefsUtil::TypedPrefMap& keys = prefs_util_->GetWhitelistedKeys();
     for (const auto& it : keys) {
       std::string pref_name = it.first;
       if (prefs_util_->IsCrosSetting(pref_name)) {
 #if defined(OS_CHROMEOS)
-        std::unique_ptr<chromeos::CrosSettings::ObserverSubscription> observer =
-            chromeos::CrosSettings::Get()->AddSettingsObserver(
+        std::unique_ptr<chromeos::CrosSettings::ObserverSubscription>
+            subscription = chromeos::CrosSettings::Get()->AddSettingsObserver(
                 pref_name.c_str(),
                 base::Bind(&SettingsPrivateEventRouter::OnPreferenceChanged,
                            base::Unretained(this), pref_name));
-        linked_ptr<chromeos::CrosSettings::ObserverSubscription> subscription(
-            observer.release());
         cros_settings_subscription_map_.insert(
-            make_pair(pref_name, subscription));
+            make_pair(pref_name, std::move(subscription)));
 #endif
       } else {
         FindRegistrarForPref(it.first)
             ->Add(pref_name,
                   base::Bind(&SettingsPrivateEventRouter::OnPreferenceChanged,
                              base::Unretained(this)));
       }
     }
   } else if (!should_listen && listening_) {
     const PrefsUtil::TypedPrefMap& keys = prefs_util_->GetWhitelistedKeys();
@@ skipping 30 matching lines @@
       api::settings_private::OnPrefsChanged::kEventName, std::move(args)));
   event_router->BroadcastEvent(std::move(extension_event));
 }
 
 SettingsPrivateEventRouter* SettingsPrivateEventRouter::Create(
     content::BrowserContext* context) {
   return new SettingsPrivateEventRouter(context);
 }
 
 }  // namespace extensions