[Extensions] Migrate ExtensionInstallPrompt::Delegate to be a callback

chrome/browser/extensions/webstore_reinstaller.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_EXTENSIONS_WEBSTORE_REINSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_REINSTALLER_H_
 
 #include "chrome/browser/extensions/webstore_standalone_installer.h"
 #include "content/public/browser/web_contents_observer.h"
 
@@ skipping 22 matching lines @@
   const GURL& GetRequestorURL() const override;
   bool ShouldShowPostInstallUI() const override;
   bool ShouldShowAppInstalledBubble() const override;
   content::WebContents* GetWebContents() const override;
   scoped_ptr<ExtensionInstallPrompt::Prompt> CreateInstallPrompt()
       const override;
   bool CheckInlineInstallPermitted(const base::DictionaryValue& webstore_data,
                                    std::string* error) const override;
   bool CheckRequestorPermitted(const base::DictionaryValue& webstore_data,
                                std::string* error) const override;
-  void InstallUIProceed() override;
+  void OnInstallPromptDone(ExtensionInstallPrompt::Result result) override;
 
   // content::WebContentsObserver:
   void WebContentsDestroyed() override;
 
   // Called once all data from the old extension installation is removed.
   void OnDeletionDone();
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_REINSTALLER_H_