Replace scoped_ptr with std::unique_ptr in //ui

ui/web_dialogs/web_dialog_web_contents_delegate.h

 // Copyright (c) 2012 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 UI_WEB_DIALOGS_WEB_DIALOG_WEB_CONTENTS_DELEGATE_H_
 #define UI_WEB_DIALOGS_WEB_DIALOG_WEB_CONTENTS_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "content/public/browser/web_contents_delegate.h"
@@ skipping 53 matching lines @@
                       bool user_gesture,
                       bool* was_blocked) override;
   bool IsPopupOrPanel(const content::WebContents* source) const override;
   bool PreHandleGestureEvent(content::WebContents* source,
                              const blink::WebGestureEvent& event) override;
 
  private:
   // Weak pointer.  Always an original profile.
   content::BrowserContext* browser_context_;
 
-  scoped_ptr<WebContentsHandler> handler_;
+  std::unique_ptr<WebContentsHandler> handler_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDialogWebContentsDelegate);
 };
 
 }  // namespace ui
 
 #endif  // UI_WEB_DIALOGS_WEB_DIALOG_WEB_CONTENTS_DELEGATE_H_