Discard unused AppListPrefs code.

chrome/browser/ui/app_list/app_list_prefs_factory.h

Index: chrome/browser/ui/app_list/app_list_prefs_factory.h
diff --git a/chrome/browser/ui/app_list/app_list_prefs_factory.h b/chrome/browser/ui/app_list/app_list_prefs_factory.h
deleted file mode 100644
index 84bcb154c7f6b23d646fff99421143e2c1228699..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/app_list/app_list_prefs_factory.h
+++ /dev/null
@@ -1,40 +0,0 @@
-// 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_FACTORY_H_
-#define CHROME_BROWSER_UI_APP_LIST_APP_LIST_PREFS_FACTORY_H_
-
-#include <memory>
-
-#include "base/memory/singleton.h"
-#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
-
-namespace app_list {
-
-class AppListPrefs;
-
-class AppListPrefsFactory : public BrowserContextKeyedServiceFactory {
- public:
-  static AppListPrefs* GetForBrowserContext(content::BrowserContext* context);
-
-  static AppListPrefsFactory* GetInstance();
-
-  void SetInstanceForTesting(content::BrowserContext* context,
-                             std::unique_ptr<AppListPrefs> prefs);
-
- private:
-  friend struct base::DefaultSingletonTraits<AppListPrefsFactory>;
-
-  AppListPrefsFactory();
-  ~AppListPrefsFactory() override;
-
-  KeyedService* BuildServiceInstanceFor(
-      content::BrowserContext* context) const override;
-  content::BrowserContext* GetBrowserContextToUse(
-      content::BrowserContext* context) const override;
-};
-
-}  // namespace app_list
-
-#endif  // CHROME_BROWSER_UI_APP_LIST_APP_LIST_PREFS_FACTORY_H_