Implement WebPushProvider.unregister() in Chromium.

content/browser/push_messaging/push_messaging_message_filter.h

Index: content/browser/push_messaging/push_messaging_message_filter.h
diff --git a/content/browser/push_messaging/push_messaging_message_filter.h b/content/browser/push_messaging/push_messaging_message_filter.h
index c60993d5e9efe9e1f4e9ce4f8f667c7b29bd4b5c..86d5fdfa0aa7fd03e4d4bd190ddba84b19d48432 100644
--- a/content/browser/push_messaging/push_messaging_message_filter.h
+++ b/content/browser/push_messaging/push_messaging_message_filter.h
@@ -114,6 +114,21 @@ class PushMessagingMessageFilter : public BrowserMessageFilter {
                                PushRegistrationStatus status,
                                const std::string& push_registration_id);
 
+  // Unregister methods --------------------------------------------------------
+
+  void OnUnregister(int request_id,
+                    int64 service_worker_registration_id);
+
+  void UnregisterOnUI(int request_id,
+                      int64 service_worker_registration_id,
+                      const GURL& requesting_origin);
+
+  void DidUnregister(int request_id,
+                     PushUnregistrationStatus unregistration_status);
+
+
+  // GetRegistration methods ---------------------------------------------------
+
   void OnGetRegistration(int request_id,
                          int64 service_worker_registration_id);