Replaced webPageOrderedClose with WebStateDelegate API.

ios/web/public/test/crw_mock_web_state_delegate.mm

Index: ios/web/public/test/crw_mock_web_state_delegate.mm
diff --git a/ios/web/public/test/crw_mock_web_state_delegate.mm b/ios/web/public/test/crw_mock_web_state_delegate.mm
index 06cbb759f00186988fcd01241fa84f4e0c181f86..fda453cec2b682b52c82cb78a512e57fc078041a 100644
--- a/ios/web/public/test/crw_mock_web_state_delegate.mm
+++ b/ios/web/public/test/crw_mock_web_state_delegate.mm
@@ -18,6 +18,7 @@
 
 @synthesize webState = _webState;
 @synthesize webStateCreationRequested = _webStateCreationRequested;
+@synthesize webStateClosingRequested = _webStateClosingRequested;
 @synthesize repostFormWarningRequested = _repostFormWarningRequested;
 @synthesize authenticationRequested = _authenticationRequested;
 
@@ -30,6 +31,11 @@
   return nil;
 }
 
+- (void)closeWebState:(web::WebState*)webState {
+  _webState = webState;
+  _webStateClosingRequested = YES;
+}
+
 - (web::WebState*)webState:(web::WebState*)webState
          openURLWithParams:(const web::WebState::OpenURLParams&)params {
   _webState = webState;