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

ios/chrome/browser/dom_distiller/distiller_viewer.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 IOS_CHROME_BROWSER_DOM_DISTILLER_DISTILLER_VIEWER_H_
 #define IOS_CHROME_BROWSER_DOM_DISTILLER_DISTILLER_VIEWER_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/dom_distiller/core/dom_distiller_request_view_base.h"
 #include "components/dom_distiller/core/task_tracker.h"
 
 class GURL;
 
 namespace ios {
 class ChromeBrowserState;
 }
 
 namespace dom_distiller {
@@ skipping 25 matching lines @@
   std::string js_buffer_;
   // Callback to run once distillation is complete.
   const DistillationFinishedCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(DistillerViewer);
 };
 
 }  // namespace dom_distiller
 
 #endif  // IOS_CHROME_BROWSER_DOM_DISTILLER_DISTILLER_VIEWER_H_