Convert //chrome/browser/extensions from scoped_ptr to std::unique_ptr

chrome/browser/extensions/webstore_startup_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_WEBSTORE_STARTUP_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_STARTUP_INSTALLER_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "chrome/browser/extensions/webstore_install_with_prompt.h"
@@ skipping 14 matching lines @@
                            bool show_prompt,
                            const Callback& callback);
 
  protected:
   friend class base::RefCountedThreadSafe<WebstoreStartupInstaller>;
   FRIEND_TEST_ALL_PREFIXES(WebstoreStartupInstallerTest, DomainVerification);
 
   ~WebstoreStartupInstaller() override;
 
   // Implementations of WebstoreStandaloneInstaller Template Method's hooks.
-  scoped_ptr<ExtensionInstallPrompt::Prompt> CreateInstallPrompt()
+  std::unique_ptr<ExtensionInstallPrompt::Prompt> CreateInstallPrompt()
       const override;
 
  private:
   bool show_prompt_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebstoreStartupInstaller);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_STARTUP_INSTALLER_H_