Replaced webPageOrderedClose with WebStateDelegate API.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index 0758389f047aa29c97410f074cf820f928641919..6b22dcdb0fa71d46eab5b2e861235a3268a59160 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -3146,7 +3146,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
       // load operation (e.g. notifying all observers) and record the URL so
       // that errors reported following the 'NO' reply can be safely ignored.
       if ([self shouldClosePageOnNativeApplicationLoad])
-        [_delegate webPageOrderedClose];
+        _webStateImpl->CloseWebState();
       [self stopLoading];
       [_openedApplicationURL addObject:request.URL];
       return NO;
@@ -3197,7 +3197,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
       // safely ignored.
       [_openedApplicationURL addObject:request.URL];
       if ([self shouldClosePageOnNativeApplicationLoad])
-        [_delegate webPageOrderedClose];
+        _webStateImpl->CloseWebState();
     }
     return NO;
   }
@@ -4365,7 +4365,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
 
 - (void)webViewDidClose:(WKWebView*)webView {
   if (self.sessionController.openedByDOM) {
-    [self.delegate webPageOrderedClose];
+    _webStateImpl->CloseWebState();
   }
 }