Replaced webPageOrderedClose with WebStateDelegate API.

ios/web/public/web_state/web_state_delegate_bridge.h

Index: ios/web/public/web_state/web_state_delegate_bridge.h
diff --git a/ios/web/public/web_state/web_state_delegate_bridge.h b/ios/web/public/web_state/web_state_delegate_bridge.h
index 11dae7c4cd7cde56725d2247b100d259e679126f..739e4a6b71cecce61f69ce665767d1aa22f252cc 100644
--- a/ios/web/public/web_state/web_state_delegate_bridge.h
+++ b/ios/web/public/web_state/web_state_delegate_bridge.h
@@ -24,6 +24,10 @@
                   openerURL:(const GURL&)openerURL
             initiatedByUser:(BOOL)initiatedByUser;
 
+// Called when the page calls wants to close self by calling window.close()
+// JavaScript API.
+- (void)closeWebState:(web::WebState*)webState;
+
 // Returns the WebState the URL is opened in, or nullptr if the URL wasn't
 // opened immediately.
 - (web::WebState*)webState:(web::WebState*)webState
@@ -71,6 +75,7 @@ class WebStateDelegateBridge : public web::WebStateDelegate {
                               const GURL& url,
                               const GURL& opener_url,
                               bool initiated_by_user) override;
+  void CloseWebState(WebState* source) override;
   WebState* OpenURLFromWebState(WebState*,
                                 const WebState::OpenURLParams&) override;
   bool HandleContextMenu(WebState* source,