Guest mode causes certain settings to be hidden.

chrome/browser/resources/options/search_page.js

Index: chrome/browser/resources/options/search_page.js
diff --git a/chrome/browser/resources/options/search_page.js b/chrome/browser/resources/options/search_page.js
index 0152017b9fae2c119308020c7dd6905107ba86ef..d5b982671c212a580244a490bcc13992470809a6 100644
--- a/chrome/browser/resources/options/search_page.js
+++ b/chrome/browser/resources/options/search_page.js
@@ -187,6 +187,10 @@ cr.define('options', function() {
       if (!this.searchActive_ && !active)
         return;
 
+      // Guest users should never have active search.
+      if (loadTimeData.getBoolean('profileIsGuest'))
+        return;
+
       this.searchActive_ = active;
 
       if (active) {
@@ -260,6 +264,10 @@ cr.define('options', function() {
      * @private
      */
     setSearchText_: function(text) {
+      // Guest users should never have search text.
+      if (loadTimeData.getBoolean('profileIsGuest'))
+        return;
+
       // Prevent recursive execution of this method.
       if (this.insideSetSearchText_) return;
       this.insideSetSearchText_ = true;