[Contextual Search] Remove opt-in code.

chrome/browser/resources/contextual_search/promo.js

-/* Copyright 2014 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.
-*/
-
-<include src="../../../../ui/webui/resources/js/util.js">
-<include src="../../../../ui/webui/resources/js/load_time_data.js">
-
-/**
- * The amount of delay to use in the opt-in action in order to give time for
- * the fade-out animation to execute, before navigating to the opt-in URL,
- * in milliseconds.
- * @const
- */
-var OPT_IN_DELAY_MS = 65;
-
-/**
- * Once the DOM is loaded, determine if the header image is to be kept and
- * register a handler to add the 'hide' class to the container element in order
- * to hide it.
- */
-document.addEventListener('DOMContentLoaded', function(event) {
-  if (config['hideHeader']) {
-    removeHeaderImages();
-  }
-  $('optin-button').addEventListener('click', function() {
-    $('container').classList.add('hide');
-    setTimeout(function() {
-      location.hash = 'optin';
-    }, OPT_IN_DELAY_MS);
-  });
-  $('optout-button').addEventListener('click', function() {
-    location.hash = 'optout';
-  });
-});
-
-/**
- * Returns the height of the content. Method called from Chrome to properly size
- * the view embedding it.
- * @return {number} The height of the content, in pixels.
- */
-function getContentHeight() {
-  return $('container').clientHeight;
-}
-
-/**
- * Removes all header images from the promo.
- */
-function removeHeaderImages() {
-  var images = document.querySelectorAll('.header-image');
-  for (var i = 0, length = images.length; i < length; i++) {
-    var image = images[i];
-    var parent = image.parentElement;
-    if (parent) {
-      parent.removeChild(image);
-    }
-  }
-}