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

chrome/browser/extensions/extension_install_prompt_test_helper.h

 // Copyright 2015 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_EXTENSION_INSTALL_PROMPT_TEST_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_TEST_HELPER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 
 // A helper class to be used with ExtensionInstallPrompt that keeps track of the
 // result. Note that this class does no lifetime management.
 class ExtensionInstallPromptTestHelper {
  public:
   ExtensionInstallPromptTestHelper();
   explicit ExtensionInstallPromptTestHelper(const base::Closure& quit_closure);
   ~ExtensionInstallPromptTestHelper();
 
   // Returns a callback to be used with the ExtensionInstallPrompt.
   ExtensionInstallPrompt::DoneCallback GetCallback();
 
   // Note: This ADD_FAILURE()s if result_ has not been set.
   ExtensionInstallPrompt::Result result() const;
 
   bool has_result() const { return result_.get() != nullptr; }
 
  private:
   void HandleResult(ExtensionInstallPrompt::Result result);
 
-  scoped_ptr<ExtensionInstallPrompt::Result> result_;
+  std::unique_ptr<ExtensionInstallPrompt::Result> result_;
 
   // A closure to run once HandleResult() has been called; used for exiting
   // run loops in tests.
   base::Closure quit_closure_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionInstallPromptTestHelper);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_TEST_HELPER_H_