Update the Website Settings options page when a Content Setting is used.

chrome/browser/content_settings/content_settings_observer.h

Index: chrome/browser/content_settings/content_settings_observer.h
diff --git a/chrome/browser/content_settings/content_settings_observer.h b/chrome/browser/content_settings/content_settings_observer.h
index 232b1400c4a5e0b864ea9b760fb915a07d2bf4f0..6895199803ad4eafd075942f8f5d8788682f02f7 100644
--- a/chrome/browser/content_settings/content_settings_observer.h
+++ b/chrome/browser/content_settings/content_settings_observer.h
@@ -20,6 +20,11 @@ class Observer {
       ContentSettingsType content_type,
       std::string resource_identifier) = 0;
 
+  virtual void OnContentSettingUsed(
+      const ContentSettingsPattern& primary_pattern,
+      const ContentSettingsPattern& secondary_pattern,
+      ContentSettingsType content_type) {}
+
  protected:
   virtual ~Observer() {}
 };