Integration tests for WebStateDelegate::OnAuthRequired callback.

ios/web/public/test/fakes/test_web_state_delegate.mm

 // Copyright 2017 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/public/test/fakes/test_web_state_delegate.h"
 
 #include "base/memory/ptr_util.h"
 
 namespace web {
 
 TestAuthenticationRequest::TestAuthenticationRequest() {}
 
 TestAuthenticationRequest::~TestAuthenticationRequest() = default;
 
+TestAuthenticationRequest::TestAuthenticationRequest(
+    const TestAuthenticationRequest&) = default;
+
 TestWebStateDelegate::TestWebStateDelegate() {}
 
 TestWebStateDelegate::~TestWebStateDelegate() = default;
 
 JavaScriptDialogPresenter* TestWebStateDelegate::GetJavaScriptDialogPresenter(
     WebState*) {
   get_java_script_dialog_presenter_called_ = true;
   return &java_script_dialog_presenter_;
 }
 
@@ skipping 19 matching lines @@
     const AuthCallback& callback) {
   last_authentication_request_ = base::MakeUnique<TestAuthenticationRequest>();
   last_authentication_request_->web_state = source;
   last_authentication_request_->protection_space.reset(
       [protection_space retain]);
   last_authentication_request_->credential.reset([credential retain]);
   last_authentication_request_->auth_callback = callback;
 }
 
 }  // namespace web