Remove unused packaged app window controls code.

extensions/renderer/resources/window_controls.js

-// Copyright 2013 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.
-
-//
-// <window-controls> shadow element implementation.
-//
-
-var chrome = requireNative('chrome').GetChrome();
-var forEach = require('utils').forEach;
-var addTagWatcher = require('tagWatcher').addTagWatcher;
-var appWindow = require('app.window');
-var getHtmlTemplate =
-  requireNative('app_window_natives').GetWindowControlsHtmlTemplate;
-
-/**
- * @constructor
- */
-function WindowControls(node) {
-  this.node_ = node;
-  this.shadowRoot_ = this.createShadowRoot_(node);
-  this.setupWindowControls_();
-}
-
-/**
- * @private
- */
-WindowControls.prototype.template_element = null;
-
-/**
- * @private
- */
-WindowControls.prototype.createShadowRoot_ = function(node) {
-  // Initialize |template| from HTML template resource and cache result.
-  var template = WindowControls.prototype.template_element;
-  if (!template) {
-    var element = document.createElement('div');
-    element.innerHTML = getHtmlTemplate();
-    WindowControls.prototype.template_element = element.firstChild;
-    template = WindowControls.prototype.template_element;
-  }
-  // Create shadow root element with template clone as first child.
-  var shadowRoot = node.createShadowRoot();
-  shadowRoot.appendChild(template.content.cloneNode(true));
-  return shadowRoot;
-}
-
-/**
- * @private
- */
-WindowControls.prototype.setupWindowControls_ = function() {
-  var self = this;
-  this.shadowRoot_.querySelector("#close-control").addEventListener('click',
-      function(e) {
-        chrome.app.window.current().close();
-      });
-
-  this.shadowRoot_.querySelector("#maximize-control").addEventListener('click',
-      function(e) {
-        self.maxRestore_();
-      });
-}
-
-/**
- * @private
- * Restore or maximize depending on current state
- */
-WindowControls.prototype.maxRestore_ = function() {
-  if (chrome.app.window.current().isMaximized()) {
-    chrome.app.window.current().restore();
-  } else {
-    chrome.app.window.current().maximize();
-  }
-}
-
-addTagWatcher('WINDOW-CONTROLS', function(addedNode) {
-  new WindowControls(addedNode);
-});