ExtJs clear grid filter

Clear grid filter and update immediatelly without remote query

HTML

<link rel="stylesheet" href="http://cdn.sencha.com/ext/gpl/4.2.0/resources/css/ext-all.css">
<!-- corresponding blog at http://blog.jardalu.com/2013/5/24/delete-row-from-grid-sencha-extjs -->
<title>ExtJs- Grid : Delete Row</title>
<div id="example-grid"></div>
<div id="button"></div>

CSS

body {
    padding: 50px 20px 0 20px;
}

JavaScript

Ext.require([
    'Ext.data.*',
    'Ext.grid.*'
]);

function getRandomDate() {
    var from = new Date(1900, 0, 1).getTime();
    var to = new Date().getTime();
    var date = new Date(from + Math.random() * (to - from));    
    return Ext.Date.clearTime(date);
}

function createFakeData(count) {
        var firstNames   = ['Ed', 'Tommy', 'Aaron', 'Abe'];
        var lastNames    = ['Spencer', 'Maintz', 'Conran', 'Elias'];            
        var data = [];
        for (var i = 0; i < count ; i++) {
            var dob = getRandomDate();           
            var firstNameId = Math.floor(Math.random() * firstNames.length);
            var lastNameId  = Math.floor(Math.random() * lastNames.length);
            var name        = Ext.String.format("{0} {1}", firstNames[firstNameId], lastNames[lastNameId]);
            data.push([name, dob]);
        }
        return data;
    }

Ext.onReady(function(){
    Ext.define('Person',{
        extend: 'Ext.data.Model',
        fields: ['Name', 'dob']
    });

    var store = new Ext.data.Store({
        data: []
    });
    
    Ext.create('Ext.grid.Panel', {
        store: store,
        columns: [
            {text: "Name", width:120, dataIndex: 'Name'},
            {text: "DOB", width: 120, dataIndex: 'dob', renderer: Ext.util.Format.dateRenderer('M d, Y')},
            {
                xtype: 'actioncolumn',
                width: 30,
                sortable: false,
                menuDisabled: true,
                items: [{
                    icon: 'http://etf-prod-projects-1415177589.us-east-1.elb.amazonaws.com/trac/docasu/export/2/trunk/client/extjs/shared/icons/fam/delete.gif',
                    handler: function(grid, rowIndex, colIndex) {
                       store.removeAt(rowIndex);
                    }
                }]
            }
        ],
        renderTo:'example-grid',
        width: 280,
        height: 280
    });   
    Ext.create('Ext.button.Button', {
        renderTo: 'button',
    ...