[Search] Add a header image to the promo flow.

chrome/browser/resources/contextual_search/promo.js

Index: chrome/browser/resources/contextual_search/promo.js
diff --git a/chrome/browser/resources/contextual_search/promo.js b/chrome/browser/resources/contextual_search/promo.js
index 1168db2f0dbd256e702db48191900283f6e7973a..cb402ef90df4c0a4314b4273ed0e3ee4713f74f6 100644
--- a/chrome/browser/resources/contextual_search/promo.js
+++ b/chrome/browser/resources/contextual_search/promo.js
@@ -3,6 +3,18 @@
    found in the LICENSE file.
 */
 
+<include src="../../../../ui/webui/resources/js/util.js">
+<include src="../../../../ui/webui/resources/js/load_time_data.js">
+
+/**
+ * Once the DOM is loaded, determine if the header image is to be kept.
+ */
+document.addEventListener('DOMContentLoaded', function(event) {
+  if (config['hideHeader']) {
+    $('container').removeChild($('header-image'));
+  }
+});
+
 /**
  * On load, registers the handler to add the 'hide' class to the container
  * element in order to hide it.