Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.h

Index: ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.h
diff --git a/ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.h b/ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.h
index 0d5d9a3da6e42b0410209699dabed5b736fe8128..daf6caa8de6dcaba3d3c9fa6742f516cf0639ea3 100644
--- a/ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.h
+++ b/ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.h
@@ -109,7 +109,7 @@ class IOSChromeBrowsingDataRemover {
   };
 
   using Callback = base::Callback<void(const NotificationDetails&)>;
-  using CallbackSubscription = scoped_ptr<
+  using CallbackSubscription = std::unique_ptr<
       base::CallbackList<void(const NotificationDetails&)>::Subscription>;
 
   // Creates a IOSChromeBrowsingDataRemover bound to a specific period of time
@@ -263,7 +263,7 @@ class IOSChromeBrowsingDataRemover {
   // Used if we need to clear history.
   base::CancelableTaskTracker history_task_tracker_;
 
-  scoped_ptr<TemplateURLService::Subscription> template_url_sub_;
+  std::unique_ptr<TemplateURLService::Subscription> template_url_sub_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeBrowsingDataRemover);
 };