Notify GCMAppHandlers when the store is reset, so they clear cached IDs

chrome/browser/push_messaging/push_messaging_service_impl.cc

Index: chrome/browser/push_messaging/push_messaging_service_impl.cc
diff --git a/chrome/browser/push_messaging/push_messaging_service_impl.cc b/chrome/browser/push_messaging/push_messaging_service_impl.cc
index 01be33903bd19535549242edf370a773f88fc19c..bfbf8a8e93ac3b34ebee469320d42612043627e6 100644
--- a/chrome/browser/push_messaging/push_messaging_service_impl.cc
+++ b/chrome/browser/push_messaging/push_messaging_service_impl.cc
@@ -252,6 +252,18 @@ void PushMessagingServiceImpl::ShutdownHandler() {
   NOTREACHED();
 }
 
+void PushMessagingServiceImpl::OnStoreReset() {
+  // Delete all cached subscriptions, since they are now invalid.
+  for (const auto& identifier : PushMessagingAppIdentifier::GetAll(profile_)) {
+    ClearPushSubscriptionId(profile_,
+                            identifier.origin(),
+                            identifier.service_worker_registration_id(),
+                            base::Bind(&base::DoNothing));
+    // TODO(johnme): Fire pushsubscriptionchange/pushsubscriptionlost SW event.
+  }
+  PushMessagingAppIdentifier::DeleteAllFromPrefs(profile_);
+}
+
 // OnMessage methods -----------------------------------------------------------
 
 void PushMessagingServiceImpl::OnMessage(const std::string& app_id,