Fix a bunch of IWYU violators that don't include scoped_ptr.h

chrome/browser/ui/webui/settings/search_engines_handler.h

 // Copyright 2016 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_UI_WEBUI_SETTINGS_SEARCH_ENGINES_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_SEARCH_ENGINES_HANDLER_H_
 
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/search_engines/edit_search_engine_controller.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
 #include "ui/base/models/table_model_observer.h"
 
 class KeywordEditorController;
 class Profile;
 
 namespace extensions {
 class Extension;
 }
@@ skipping 69 matching lines @@
       const extensions::Extension& extension);
 
   Profile* const profile_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchEnginesHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SEARCH_ENGINES_HANDLER_H_