[ios] Removed keyCode from FormActivityRegistered API.

ios/web/public/web_state/web_state_observer_bridge.h

Index: ios/web/public/web_state/web_state_observer_bridge.h
diff --git a/ios/web/public/web_state/web_state_observer_bridge.h b/ios/web/public/web_state/web_state_observer_bridge.h
index 2a689f4434f410a37a255fe1da2d0d4b38b68900..a0ba092e379315d17f69cdaa42bb094c8f0c262b 100644
--- a/ios/web/public/web_state/web_state_observer_bridge.h
+++ b/ios/web/public/web_state/web_state_observer_bridge.h
@@ -53,7 +53,6 @@ class GURL;
                                fieldName:(const std::string&)fieldName
                                     type:(const std::string&)type
                                    value:(const std::string&)value
-                                 keyCode:(int)keyCode
                             inputMissing:(BOOL)inputMissing;
 
 // Invoked by WebStateObserverBridge::FaviconUrlUpdated.
@@ -102,7 +101,6 @@ class WebStateObserverBridge : public web::WebStateObserver {
                               const std::string& field_name,
                               const std::string& type,
                               const std::string& value,
-                              int key_code,
                               bool input_missing) override;
   void FaviconUrlUpdated(const std::vector<FaviconURL>& candidates) override;
   void WebStateDestroyed() override;