[ios] Removed keyCode from FormActivityRegistered 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.
 
 #include "ios/web/web_state/web_state_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 221 matching lines @@
       load_success ? PageLoadCompletionStatus::SUCCESS
                    : PageLoadCompletionStatus::FAILURE;
   for (auto& observer : observers_)
     observer.PageLoaded(load_completion_status);
 }
 
 void WebStateImpl::OnFormActivityRegistered(const std::string& form_name,
                                             const std::string& field_name,
                                             const std::string& type,
                                             const std::string& value,
-                                            int key_code,
                                             bool input_missing) {
   for (auto& observer : observers_) {
     observer.FormActivityRegistered(form_name, field_name, type, value,
-                                    key_code, input_missing);
+                                    input_missing);
   }
 }
 
 void WebStateImpl::OnFaviconUrlUpdated(
     const std::vector<FaviconURL>& candidates) {
   for (auto& observer : observers_)
     observer.FaviconUrlUpdated(candidates);
 }
 
 void WebStateImpl::OnCredentialsRequested(
@@ skipping 477 matching lines @@
     const LoadCommittedDetails& load_details) {
   for (auto& observer : observers_)
     observer.NavigationItemCommitted(load_details);
 }
 
 WebState* WebStateImpl::GetWebState() {
   return this;
 }
 
 }  // namespace web