DevTools: Use toISOString instead of toGMTString for dates.

Source/devtools/front_end/components/CookiesTable.js

 /*
  * Copyright (C) 2009 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 233 matching lines @@
         if (cookie.type() === WebInspector.Cookie.Type.Request) {
             data.domain = WebInspector.UIString("N/A");
             data.path = WebInspector.UIString("N/A");
             data.expires = WebInspector.UIString("N/A");
         } else {
             data.domain = cookie.domain() || "";
             data.path = cookie.path() || "";
             if (cookie.maxAge())
                 data.expires = Number.secondsToString(parseInt(cookie.maxAge(), 10));
             else if (cookie.expires())
-                data.expires = new Date(cookie.expires()).toGMTString();
+                data.expires = new Date(cookie.expires()).toISOString();
             else
                 data.expires = WebInspector.UIString("Session");
         }
         data.size = cookie.size();
         const checkmark = "\u2713";
         data.httpOnly = (cookie.httpOnly() ? checkmark : "");
         data.secure = (cookie.secure() ? checkmark : "");
 
         var node = new WebInspector.DataGridNode(data);
         node.cookie = cookie;
@@ skipping 12 matching lines @@
     },
 
     _refresh: function()
     {
         if (this._refreshCallback)
             this._refreshCallback();
     },
 
     __proto__: WebInspector.VBox.prototype
 }