2013 Sharepoint-Hosted App Masterpage Provisioning Problem

Here is some code I'm currently using to set my Masterpage as the default Masterpage within my site. I'm running into a problem where I receive the onQuerySucceeded message after deploying the App. However, the Masterpage on the site does not update to the one specified within my App.

var context;
var web;
var user;

function sharePointReady() {
    updateMaster();
}
function updateMaster() {
    var clientContext = new SP.ClientContext.get_current();
    this.web = clientContext.get_web();
    this.web.set_masterUrl('/NavigationList/MasterPages/BootstrapTest.master');
    clientContext.load(this.web);
    clientContext.executeQueryAsync(
Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed)
);
}

function onQuerySucceeded(sender, args) {
    alert('New Master Page set to: ' + this.web.get_masterUrl());
}

function onQueryFailed(sender, args) {
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

I have the permissions of the web and the site collection set to full control.

Any help would be appreciated.