[Sync] Make P2PNotifier behave more like InvalidationNotifier

chrome/browser/sync/notifier/invalidation_notifier.cc

Index: chrome/browser/sync/notifier/invalidation_notifier.cc
diff --git a/chrome/browser/sync/notifier/invalidation_notifier.cc b/chrome/browser/sync/notifier/invalidation_notifier.cc
index c7e68b875c130e8c620be19c1d73382dfb193d63..17ae73878e8a3fb9a322a4553645b6b03060ca6d 100644
--- a/chrome/browser/sync/notifier/invalidation_notifier.cc
+++ b/chrome/browser/sync/notifier/invalidation_notifier.cc
@@ -83,13 +83,15 @@ void InvalidationNotifier::UpdateCredentials(
 }
 
 void InvalidationNotifier::UpdateEnabledTypes(
-    const syncable::ModelTypeSet& types) {
+    const syncable::ModelTypeSet& enabled_types) {
   DCHECK(non_thread_safe_.CalledOnValidThread());
-  invalidation_client_.RegisterTypes(types);
+  invalidation_client_.RegisterTypes(enabled_types);
 }
 
-void InvalidationNotifier::SendNotification() {
+void InvalidationNotifier::SendNotification(
+    const syncable::ModelTypeSet& changed_types) {
   DCHECK(non_thread_safe_.CalledOnValidThread());
+  // Do nothing.
 }
 
 void InvalidationNotifier::OnConnect(