[Extensions] DCHECK that ExtensionFunctions respond (and only once)

extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc

Index: extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc
diff --git a/extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc b/extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc
index ac1f41f76d54e301821857390995b16cdcebdc80..cd3bd1c452e3f7661141dd6c58b24e1735efdea1 100644
--- a/extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc
+++ b/extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc
@@ -204,7 +204,7 @@ void BluetoothSocketCreateFunction::Work() {
   bluetooth_socket::CreateInfo create_info;
   create_info.socket_id = AddSocket(socket);
   results_ = bluetooth_socket::Create::Results::Create(create_info);
-  AsyncWorkCompleted();
+  // AsyncWorkCompleted is called by AsyncWorkStart().
 }
 
 BluetoothSocketUpdateFunction::BluetoothSocketUpdateFunction() {}