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

chrome/browser/ui/app_list/app_list_prefs.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 CHROME_BROWSER_UI_APP_LIST_APP_LIST_PREFS_H_
 #define CHROME_BROWSER_UI_APP_LIST_APP_LIST_PREFS_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/values.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "sync/api/string_ordinal.h"
 
 class PrefService;
 
 namespace content {
 class BrowserContext;
 }
@@ skipping 66 matching lines @@
   explicit AppListPrefs(PrefService* pref_service);
 
   PrefService* pref_service_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListPrefs);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_APP_LIST_PREFS_H_