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

ios/chrome/test/ios_chrome_unit_test_suite.mm

 // 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.
 
 #include "ios/chrome/test/ios_chrome_unit_test_suite.h"
 
 #include "base/macros.h"
 #include "ios/chrome/browser/browser_state/browser_state_keyed_service_factories.h"
 #include "ios/chrome/browser/chrome_paths.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
@@ skipping 33 matching lines @@
 
     test_ios_chrome_provider_initializer_.reset();
     DCHECK(!ios::GetChromeBrowserProvider());
 
     DCHECK_EQ(web::GetWebClient(), web_client_.get());
     web::SetWebClient(nullptr);
     web_client_.reset();
   }
 
  private:
-  scoped_ptr<web::WebClient> web_client_;
-  scoped_ptr<ios::TestChromeProviderInitializer>
+  std::unique_ptr<web::WebClient> web_client_;
+  std::unique_ptr<ios::TestChromeProviderInitializer>
       test_ios_chrome_provider_initializer_;
-  scoped_ptr<ApplicationContext> application_context_;
+  std::unique_ptr<ApplicationContext> application_context_;
   DISALLOW_COPY_AND_ASSIGN(IOSChromeUnitTestSuiteInitializer);
 };
 
 }  // namespace
 
 IOSChromeUnitTestSuite::IOSChromeUnitTestSuite(int argc, char** argv)
     : base::TestSuite(argc, argv) {}
 
 IOSChromeUnitTestSuite::~IOSChromeUnitTestSuite() {}
 
@@ skipping 12 matching lines @@
   // test is run so that the dependencies are correctly resolved.
   EnsureBrowserStateKeyedServiceFactoriesBuilt();
 
   ios::RegisterPathProvider();
   ui::RegisterPathProvider();
 
   url::AddStandardScheme(kChromeUIScheme, url::SCHEME_WITHOUT_PORT);
 
   base::TestSuite::Initialize();
 }