Replaced webPageOrderedClose with WebStateDelegate API.

ios/web/web_state/web_state_impl.mm

 // Copyright 2013 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/web_state/web_state_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 496 matching lines @@
 WebState* WebStateImpl::CreateNewWebState(const GURL& url,
                                           const GURL& opener_url,
                                           bool initiated_by_user) {
   if (delegate_) {
     return delegate_->CreateNewWebState(this, url, opener_url,
                                         initiated_by_user);
   }
   return nullptr;
 }
 
+void WebStateImpl::CloseWebState() {
+  if (delegate_) {
+    delegate_->CloseWebState(this);
+  }
+}
+
 void WebStateImpl::OnAuthRequired(
     NSURLProtectionSpace* protection_space,
     NSURLCredential* proposed_credential,
     const WebStateDelegate::AuthCallback& callback) {
   if (delegate_) {
     delegate_->OnAuthRequired(this, protection_space, proposed_credential,
                               callback);
   } else {
     callback.Run(nil, nil);
   }
@@ skipping 213 matching lines @@
     const LoadCommittedDetails& load_details) {
   for (auto& observer : observers_)
     observer.NavigationItemCommitted(load_details);
 }
 
 WebState* WebStateImpl::GetWebState() {
   return this;
 }
 
 }  // namespace web