Expose the Website Settings page in the Content Setting page if it is enabled via flag.

chrome/browser/resources/options/options.js

Index: chrome/browser/resources/options/options.js
diff --git a/chrome/browser/resources/options/options.js b/chrome/browser/resources/options/options.js
index 8f119802ddef65b2c5c44b5da88babe97305d7b4..ae82a2599fa1bee5fe0ac48d3733a669a8befb89 100644
--- a/chrome/browser/resources/options/options.js
+++ b/chrome/browser/resources/options/options.js
@@ -45,7 +45,7 @@ var SupervisedUserImportOverlay = options.SupervisedUserImportOverlay;
 var SupervisedUserLearnMoreOverlay = options.SupervisedUserLearnMoreOverlay;
 var SyncSetupOverlay = options.SyncSetupOverlay;
 var WebsiteSettingsEditor = options.WebsiteSettings.WebsiteSettingsEditor;
-var WebsiteSettingsManager = options.WebsiteSettingsManager;
+var WebsiteSettingsManager = options.ContentSettings.WebsiteSettingsManager;
 var ThirdPartyImeConfirmOverlay = options.ThirdPartyImeConfirmOverlay;
 
 /**
@@ -116,8 +116,7 @@ function load() {
                               BrowserOptions.getInstance(),
                               [$('privacyContentSettingsButton')]);
   PageManager.registerOverlay(WebsiteSettingsManager.getInstance(),
-                              BrowserOptions.getInstance(),
-                              [$('website-management-button')]);
+                              ContentSettings.getInstance());
   PageManager.registerOverlay(WebsiteSettingsEditor.getInstance(),
                               WebsiteSettingsManager.getInstance());
   PageManager.registerOverlay(ContentSettingsExceptionsArea.getInstance(),