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

ios/web/webui/url_data_source_ios_impl.h

 // 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.
 
 #ifndef IOS_INTERNAL_WEB_WEBUI_URL_DATA_SOURCE_IMPL_IOS_H_
 #define IOS_INTERNAL_WEB_WEBUI_URL_DATA_SOURCE_IMPL_IOS_H_
 
+#include <memory>
+
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "ios/web/webui/url_data_manager_ios.h"
 
 namespace base {
 class RefCountedMemory;
 }
 
 namespace web {
 class URLDataManagerIOSBackend;
 class URLDataSourceIOS;
@@ skipping 64 matching lines @@
 
   // This field is set and maintained by URLDataManagerIOSBackend. It is set
   // when the DataSource is added, and unset if the DataSource is removed. A
   // DataSource can be removed in two ways: the URLDataManagerIOSBackend is
   // deleted, or another DataSource is registered with the same name. backend_
   // should only be accessed on the IO thread. This reference can't be via a
   // scoped_refptr else there would be a cycle between the backend and data
   // source.
   URLDataManagerIOSBackend* backend_;
 
-  scoped_ptr<URLDataSourceIOS> source_;
+  std::unique_ptr<URLDataSourceIOS> source_;
 };
 
 }  // namespace web
 
 #endif  // IOS_INTERNAL_WEB_WEBUI_URL_DATA_SOURCE_IMPL_IOS_H_