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

ios/chrome/browser/tabs/tab.mm

 // Copyright 2012 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/chrome/browser/tabs/tab.h"
 
 #import <CoreLocation/CoreLocation.h>
 #import <UIKit/UIKit.h>
 
 #include <utility>
@@ skipping 463 matching lines @@
 @synthesize isLinkLoadingPrerenderTab = isLinkLoadingPrerenderTab_;
 @synthesize isVoiceSearchResultsTab = isVoiceSearchResultsTab_;
 @synthesize delegate = delegate_;
 @synthesize tabSnapshottingDelegate = tabSnapshottingDelegate_;
 @synthesize tabHeadersDelegate = tabHeadersDelegate_;
 
 - (instancetype)initWithBrowserState:(ios::ChromeBrowserState*)browserState
                               opener:(Tab*)opener
                          openedByDOM:(BOOL)openedByDOM
                                model:(TabModel*)parentModel {
-  std::unique_ptr<web::WebStateImpl> webState(
-      new web::WebStateImpl(browserState));
-  webState->GetNavigationManagerImpl().InitializeSession(openedByDOM);
+  web::WebState::CreateParams params(browserState);
+  params.opened_by_dom = openedByDOM;
+  std::unique_ptr<web::WebState> webState = web::WebState::Create(params);
   if ([opener navigationManager]) {
     web::SerializableUserDataManager* userDataManager =
         web::SerializableUserDataManager::FromWebState(webState.get());
     userDataManager->AddSerializableData(opener.tabId, kOpenerIDKey);
     userDataManager->AddSerializableData(
         @([opener navigationManager]->GetLastCommittedItemIndex()),
         kOpenerNavigationIndexKey);
   }
 
   return [self initWithWebState:std::move(webState) model:parentModel];
@@ skipping 1013 matching lines @@
   DCHECK([self navigationManager]);
   CRWSessionController* sessionController =
       [self navigationManagerImpl]->GetSessionController();
   web::NavigationItem* lastUserItem = [sessionController lastUserItem];
   if (!lastUserItem)
     return;
 
   // |originalUrl| will be empty if a page was open by DOM.
   GURL reloadURL(lastUserItem->GetOriginalRequestURL());
   if (reloadURL.is_empty()) {
-    DCHECK(sessionController.openedByDOM);
+    DCHECK(self.webState && self.webState->IsOpenedByDOM());
     reloadURL = lastUserItem->GetVirtualURL();
   }
 
   web::NavigationManager::WebLoadParams params(reloadURL);
   params.referrer = lastUserItem->GetReferrer();
   params.transition_type = transition;
   if (self.navigationManager)
     self.navigationManager->LoadURLWithParams(params);
 }
 
@@ skipping 573 matching lines @@
 
 - (TabModel*)parentTabModel {
   return parentTabModel_;
 }
 
 - (FormInputAccessoryViewController*)inputAccessoryViewController {
   return inputAccessoryViewController_.get();
 }
 
 @end