Revert "Identity API: Add component app for auth flow UI"

chrome/browser/resources/identity_scope_approval_dialog/background.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.
-
-/**
- * Displays a webview based authorization dialog.
- * @param {string} key A unique identifier that the caller can use to locate
- *     the dialog window.
- * @param {string} url A URL that will be loaded in the webview.
- * @param {string} mode 'interactive' or 'silent'. The window will be displayed
- *     if the mode is 'interactive'.
- */
-function showAuthDialog(key, url, mode) {
-  var options = {
-    frame: 'none',
-    id: key,
-    minWidth: 1024,
-    minHeight: 768,
-    hidden: true
-  };
-  chrome.app.window.create('scope_approval_dialog.html',
-                           options,
-                           function(win) {
-    win.contentWindow.addEventListener('load', function(event) {
-      var windowParam;
-      if (mode == 'interactive')
-        windowParam = win;
-      win.contentWindow.loadAuthUrlAndShowWindow(url, windowParam);
-    });
-  });
-}
-
-chrome.identityPrivate.onWebFlowRequest.addListener(showAuthDialog);
-