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

ios/web/web_state/crw_pass_kit_downloader_unittest.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.
 
 #import "ios/web/web_state/crw_pass_kit_downloader.h"
 
 #import <Foundation/Foundation.h>
 
+#include <memory>
+
 #import "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #import "ios/web/test/web_test.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_response_headers.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_test_util.h"
 #include "testing/gtest_mac.h"
 #include "url/gurl.h"
 
 using net::HttpResponseHeaders;
@@ skipping 35 matching lines @@
     fetcher->set_status(status);
     fetcher->set_response_code(response_code);
     scoped_refptr<HttpResponseHeaders> headers;
     headers = new HttpResponseHeaders("HTTP/1.x 200 OK\0");
     headers->AddHeader("Content-Type: " + mime_type);
     fetcher->set_response_headers(headers);
   }
 
   // Test fetcher factory from which we access and control the URLFetcher
   // used in CRWPassKitDownloader.
-  scoped_ptr<net::TestURLFetcherFactory> fetcher_factory_;
+  std::unique_ptr<net::TestURLFetcherFactory> fetcher_factory_;
 
   // The CRWPassKitDownloader that is being tested.
   base::scoped_nsobject<CRWPassKitDownloader> downloader_;
 
   // Indicates whether or not the downloader successfully downloaded data. It is
   // set from the completion handler based on whether actual data is equal to
   // expected data.
   bool completion_handler_success_;
 };
 
@@ skipping 70 matching lines @@
   ASSERT_TRUE(fetcher);
   ASSERT_EQ(test_url, fetcher->GetOriginalURL());
   SetUpFetcher(fetcher, URLRequestStatus(), 200, kPassKitMimeType);
   fetcher->delegate()->OnURLFetchComplete(fetcher);
 
   EXPECT_FALSE([shared_app isNetworkActivityIndicatorVisible]);
   EXPECT_FALSE(completion_handler_success_);
 }
 
 }  // namespace