Send a message to the renderers when content settings change.

chrome/common/notification_type.h

Index: chrome/common/notification_type.h
diff --git a/chrome/common/notification_type.h b/chrome/common/notification_type.h
index 9e336e0f39bdf931bbeb6c2149a20f3109a86a02..489a1d743888d92c4c9d6d6e71ca1598fe84bdf5 100644
--- a/chrome/common/notification_type.h
+++ b/chrome/common/notification_type.h
@@ -828,6 +828,12 @@ class NotificationType {
     // Details will be an AccessibilityControlInfo.
     ACCESSIBILITY_TEXT_CHANGED,
 
+    // Content Settings --------------------------------------------------------
+
+    // Sent when content settings change. The source is a HostContentSettings
+    // object, the details are ContentSettingsNotificationsDetails.
+    CONTENT_SETTINGS_CHANGED,
+
     // Count (must be last) ----------------------------------------------------
     // Used to determine the number of notification types.  Not valid as
     // a type parameter when registering for or posting notifications.