Thank alls,

I used code below for Odoo V13 and it's worked.

odoo.define('your_module_name.WebClient', function (require) {

"use strict";

    var AbstractWebClient = require('web.AbstractWebClient');

    AbstractWebClient = AbstractWebClient.include({

        start: function (parent) {

            this.set('title_part', {"zopenerp": "Your title!"});

            this._super(parent);

        },

    });

});

I got the answer for the My question 

https://stackoverflow.com/questions/40418642/odoo-9-inherit-js-file

Visit this stack overflow link, This is working in Odoo 9 

openerp.module_name = function(instance){
    var _t = instance.web._t,
    _lt = instance.web._lt;
    var QWeb = instance.web.qweb;

    instance.web.WebClient.include({

        start: function() {
            this.set('title_part', {"zopenerp": "Odoo9"});
            return this._super();
            },
        });
}

hai,

after changing 

this.set('title_part', {"zopenerp": "Odoo9"}); to 

this.set('title_part', {"zopenerp": "Your required name"}); try to open the localhost in another browser. This was because of cache that wont allow the changes in present browser

There is a free module that lets you change the title. Plus it conveniently adds a field in the settings menu so you can change the title anytime instead of hard-coding it. It's available for a whole bunch of Odoo versions.

https://apps.odoo.com/apps/modules/13.0/web_window_title/

And even if you don't want to install it it's very helpful to look up/compare your code.