Moved |openedByDOM| to WebState's CreateParams and public interface.

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"
-#import "ios/web/web_state/web_state_impl.h"
 
 namespace web {
 
 TestOpenURLRequest::TestOpenURLRequest()
     : params(GURL(),
              Referrer(),
              WindowOpenDisposition::UNKNOWN,
              ui::PAGE_TRANSITION_LINK,
              false) {}
 
@@ skipping 29 matching lines @@
   last_create_new_web_state_request_->url = url;
   last_create_new_web_state_request_->opener_url = opener_url;
   last_create_new_web_state_request_->initiated_by_user = initiated_by_user;
 
   if (!initiated_by_user &&
       allowed_popups_.find(opener_url) == allowed_popups_.end()) {
     popups_.push_back(TestPopup(url, opener_url));
     return nullptr;
   }
 
-  std::unique_ptr<WebStateImpl> child(
-      base::MakeUnique<WebStateImpl>(source->GetBrowserState()));
-  child->GetNavigationManagerImpl().InitializeSession(YES /*opened_by_dom*/);
+  web::WebState::CreateParams params(source->GetBrowserState());
+  params.created_with_opener = true;
+  std::unique_ptr<web::WebState> child = web::WebState::Create(params);
   child->SetWebUsageEnabled(true);
 
   child_windows_.push_back(std::move(child));
   return child_windows_.back().get();
 }
 
 void TestWebStateDelegate::CloseWebState(WebState* source) {
   last_close_web_state_request_ = base::MakeUnique<TestCloseWebStateRequest>();
   last_close_web_state_request_->web_state = source;
 
@@ skipping 48 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