Remove iOS specific code from ChromeRLZTrackerDelegate.

chrome/browser/rlz/chrome_rlz_tracker_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_RLZ_CHROME_RLZ_TRACKER_DELEGATE_H_
 #define CHROME_BROWSER_RLZ_CHROME_RLZ_TRACKER_DELEGATE_H_
 
-#include "base/callback_list.h"
+#include "base/callback.h"
 #include "base/macros.h"
 #include "components/rlz/rlz_tracker_delegate.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
 // ChromeRLZTrackerDelegate implements RLZTrackerDelegate abstract interface
 // and provides access to Chrome features.
 class ChromeRLZTrackerDelegate : public rlz::RLZTrackerDelegate,
@@ skipping 28 matching lines @@
                const content::NotificationDetails& details) override;
 
   content::NotificationRegistrar registrar_;
   base::Closure on_omnibox_search_callback_;
   base::Closure on_homepage_search_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeRLZTrackerDelegate);
 };
 
 #endif  // CHROME_BROWSER_RLZ_CHROME_RLZ_TRACKER_DELEGATE_H_