chrome://settings - Provide method for pages to prevent themselves being shown.

chrome/browser/resources/options/personal_options.js

Index: chrome/browser/resources/options/personal_options.js
diff --git a/chrome/browser/resources/options/personal_options.js b/chrome/browser/resources/options/personal_options.js
index 930be56c278c62d5c2657d5f9d01db97779c9422..8775ec0ca8ced98f51eb343f9e71f44fae4fa001 100644
--- a/chrome/browser/resources/options/personal_options.js
+++ b/chrome/browser/resources/options/personal_options.js
@@ -80,8 +80,9 @@ cr.define('options', function() {
       if (cr.commandLine.options['--bwsi']) {
         // Disable the screen lock checkbox for the guest mode.
         $('enable-screen-lock').disabled = true;
+      }
 
-        // Disable passwords management settings for the guest mode.
+      if (PersonalOptions.disablePasswordManagement()) {
         $('passwords-offersave').disabled = true;
         $('passwords-neversave').disabled = true;
         $('passwords-offersave').value = false;
@@ -184,6 +185,15 @@ cr.define('options', function() {
     },
   };
 
+  /**
+   * Returns whether the user should be able to manage (view and edit) their
+   * stored passwords. Password management is disabled in guest mode.
+   * @return {boolean} True if password management should be disabled.
+   */
+  PersonalOptions.disablePasswordManagement = function() {
+    return cr.commandLine.options['--bwsi'];
+  };
+
   // Forward public APIs to private implementations.
   [
     'setSyncEnabled',