Replaced webPageOrderedClose with WebStateDelegate API.

ios/chrome/browser/ui/browser_view_controller.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/ui/browser_view_controller.h"
 
 #import <AssetsLibrary/AssetsLibrary.h>
 #import <MobileCoreServices/MobileCoreServices.h>
 #import <PassKit/PassKit.h>
 #import <Photos/Photos.h>
@@ skipping 2397 matching lines @@
   params.is_renderer_initiated = true;
   Tab* childTab = [[self tabModel]
       insertTabWithLoadParams:params
                        opener:currentTab
                   openedByDOM:YES
                       atIndex:TabModelConstants::kTabPositionAutomatically
                  inBackground:NO];
   return childTab.webState;
 }
 
+- (void)closeWebState:(web::WebState*)webState {
+  // Only allow a web page to close itself if it was opened by DOM, or if there
+  // are no navigation items.
+  Tab* tab = LegacyTabHelper::GetTabForWebState(webState);
+  DCHECK([[tab navigationManagerImpl]->GetSessionController() isOpenedByDOM] ||
+         ![tab navigationManager]->GetItemCount());
+
+  if (![self tabModel])
+    return;
+
+  NSUInteger index = [[self tabModel] indexOfTab:tab];
+  if (index != NSNotFound)
+    [[self tabModel] closeTabAtIndex:index];
+}
+
 - (web::WebState*)webState:(web::WebState*)webState
          openURLWithParams:(const web::WebState::OpenURLParams&)params {
   switch (params.disposition) {
     case WindowOpenDisposition::NEW_FOREGROUND_TAB:
     case WindowOpenDisposition::NEW_BACKGROUND_TAB: {
       Tab* tab = [[self tabModel]
           insertTabWithURL:params.url
                   referrer:params.referrer
                 transition:params.transition
                     opener:LegacyTabHelper::GetTabForWebState(webState)
@@ skipping 2660 matching lines @@
 
 - (UIView*)voiceSearchButton {
   return _voiceSearchButton;
 }
 
 - (id<LogoAnimationControllerOwner>)logoAnimationControllerOwner {
   return [self currentLogoAnimationControllerOwner];
 }
 
 @end