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

ios/web/public/test/response_providers/file_based_response_provider.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 IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_FILE_BASED_RESPONSE_PROVIDER_H_
 #define IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_FILE_BASED_RESPONSE_PROVIDER_H_
 
+#include <memory>
+
 #include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
 #include "ios/web/public/test/response_providers/file_based_response_provider_impl.h"
 #include "ios/web/public/test/response_providers/response_provider.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace web {
 
 // FileBasedResponseProvider tries to resolve URL as if it were a path relative
 // to |path| on the filesystem.
 class FileBasedResponseProvider : public ResponseProvider {
  public:
   explicit FileBasedResponseProvider(const base::FilePath& path);
   ~FileBasedResponseProvider() override;
 
   // web::ReponseProvider implementation.
   bool CanHandleRequest(const Request& request) override;
   GCDWebServerResponse* GetGCDWebServerResponse(
       const Request& request) override;
 
  private:
-  scoped_ptr<FileBasedResponseProviderImpl> response_provider_impl_;
+  std::unique_ptr<FileBasedResponseProviderImpl> response_provider_impl_;
 };
 }
 
 #endif  // IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_FILE_BASED_RESPONSE_PROVIDER_H_