[ios] Removed keyCode from FormActivityRegistered API.

ios/chrome/browser/autofill/autofill_agent.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.
 
 #import "ios/chrome/browser/autofill/autofill_agent.h"
 
 #include <memory>
 #include <string>
 
 #include "base/format_macros.h"
@@ skipping 675 matching lines @@
       minimumRequiredFieldsCount:autofill::kRequiredFieldsForPredictionRoutines
                          pageURL:pageURL
                completionHandler:completionHandler];
 }
 
 - (void)webState:(web::WebState*)webState
     didRegisterFormActivityWithFormNamed:(const std::string&)formName
                                fieldName:(const std::string&)fieldName
                                     type:(const std::string&)type
                                    value:(const std::string&)value
-                                 keyCode:(int)keyCode
                             inputMissing:(BOOL)inputMissing {
   if (!browserState_->GetPrefs()->GetBoolean(autofill::prefs::kAutofillEnabled))
     return;
   web::URLVerificationTrustLevel trustLevel;
   const GURL pageURL(webState->GetCurrentURL(&trustLevel));
   if (trustLevel != web::URLVerificationTrustLevel::kAbsolute) {
     DLOG(WARNING) << "Form activity not handled on untrusted page";
     return;
   }
 
@@ skipping 154 matching lines @@
     }
     predictionData.SetWithoutPathExpansion(base::UTF16ToUTF8(formData.name),
                                            formJSONData);
   }
   std::string dataString;
   base::JSONWriter::Write(predictionData, &dataString);
   [jsAutofillManager_ fillPredictionData:base::SysUTF8ToNSString(dataString)];
 }
 
 @end