Update ExtensionInstallChecker to use PreloadCheck classes

chrome/browser/extensions/crx_installer.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 CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 225 matching lines @@
                        const Extension* extension,
                        const SkBitmap& install_icon) override;
 
   // Called on the UI thread to start the requirements, policy and blacklist
   // checks on the extension.
   void CheckInstall();
 
   // Runs on the UI thread. Callback from ExtensionInstallChecker.
   void OnInstallChecksComplete(int failed_checks);
 
-  // Runs on the UI thread. Callback from Blacklist.
-  void OnBlacklistChecked(
-      extensions::BlacklistState blacklist_state);
-
   // Runs on the UI thread. Confirms the installation to the ExtensionService.
   void ConfirmInstall();
 
   // Runs on the UI thread. Updates the creation flags for the extension and
   // calls CompleteInstall().
   void UpdateCreationFlagsAndCompleteInstall();
 
   // Runs on File thread. Install the unpacked extension into the profile and
   // notify the frontend.
   void CompleteInstall();
@@ skipping 185 matching lines @@
 
   // Performs requirements, policy and blacklist checks on the extension.
   std::unique_ptr<ExtensionInstallChecker> install_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(CrxInstaller);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_