Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/test/testing_application_context.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 IOS_CHROME_TEST_TESTING_APPLICATION_CONTEXT_H_
 #define IOS_CHROME_TEST_TESTING_APPLICATION_CONTEXT_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "ios/chrome/browser/application_context.h"
 
 class TestingApplicationContext : public ApplicationContext {
  public:
   TestingApplicationContext();
   ~TestingApplicationContext() override;
 
   // Convenience method to get the current application context as a
   // TestingApplicationContext.
@@ skipping 29 matching lines @@
   component_updater::ComponentUpdateService* GetComponentUpdateService()
       override;
   CRLSetFetcher* GetCRLSetFetcher() override;
   safe_browsing::SafeBrowsingService* GetSafeBrowsingService() override;
 
  private:
   base::ThreadChecker thread_checker_;
   std::string application_locale_;
   PrefService* local_state_;
   ios::ChromeBrowserStateManager* chrome_browser_state_manager_;
-  scoped_ptr<network_time::NetworkTimeTracker> network_time_tracker_;
+  std::unique_ptr<network_time::NetworkTimeTracker> network_time_tracker_;
   bool was_last_shutdown_clean_;
 
   DISALLOW_COPY_AND_ASSIGN(TestingApplicationContext);
 };
 
 #endif  // IOS_CHROME_TEST_TESTING_APPLICATION_CONTEXT_H_