[ios] Removed keyCode from FormActivityRegistered API.

ios/web/web_state/js/resources/core.js

 // Copyright 2012 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.
 
 // This file adheres to closure-compiler conventions in order to enable
 // compilation with ADVANCED_OPTIMIZATIONS. In particular, members that are to
 // be accessed externally should be specified in this['style'] as opposed to
 // this.style because member identifiers are minified by default.
 // See http://goo.gl/FwOgy
 
@@ skipping 275 matching lines @@
       var fieldName = srcElement.name || '';
       var value = srcElement.value || '';
 
       var msg = {
         'command': 'form.activity',
         'formName': __gCrWeb.common.getFormIdentifier(evt.srcElement.form),
         'fieldName': fieldName,
         'type': evt.type,
         'value': value
       };
-      if (evt.keyCode)
-        msg.keyCode = evt.keyCode;
       invokeOnHost_(msg);
     };
 
     // Focus events performed on the 'capture' phase otherwise they are often
     // not received.
     document.addEventListener('focus', formActivity, true);
     document.addEventListener('blur', formActivity, true);
     document.addEventListener('change', formActivity, true);
 
     // Text input is watched at the bubbling phase as this seems adequate in
@@ skipping 361 matching lines @@
       });
     }, false);
 
     addFormEventListeners_();
 
     return true;
   };
 
   __gCrWeb.core.documentInject();
 }());  // End of anonymous object