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 561fadc0ab6e2842a1535b2a062f7f9fbfe7d3dd..77185ce4092acbe18d6df392269ef2770e6f51b3 100644
--- a/content/browser/push_messaging/push_messaging_message_filter.h
+++ b/content/browser/push_messaging/push_messaging_message_filter.h
@@ -106,6 +106,21 @@ 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);