Add a feature flag for enabling subscription restrictions

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 0117f1dc36c52fa66742a45788dfb37c3fb01a65..d36fc89285060382ea2d1a719a4fc4a21633d42a 100644
--- a/chrome/browser/push_messaging/push_messaging_service_impl.cc
+++ b/chrome/browser/push_messaging/push_messaging_service_impl.cc
@@ -335,10 +335,11 @@ void PushMessagingServiceImpl::OnSendAcknowledged(
   NOTREACHED() << "The Push API shouldn't have sent messages upstream";
 }
 
-// GetPushEndpoint method ------------------------------------------------------
+// GetEndpoint method ----------------------------------------------------------
 
-GURL PushMessagingServiceImpl::GetPushEndpoint() {
-  return GURL(std::string(kPushMessagingEndpoint));
+GURL PushMessagingServiceImpl::GetEndpoint(bool standard_protocol) const {
+  return GURL(standard_protocol ? kPushMessagingPushProtocolEndpoint
+                                : kPushMessagingEndpoint);
 }
 
 // Subscribe and GetPermissionStatus methods -----------------------------------