Merge m-c to mozilla-inbound

dom/indexedDB/ActorsParent.cpp

@@ -20130,9 +20130,13 @@ FactoryOp::ActorDestroy(ActorDestroyReason aWhy)
 
   NoteActorDestroyed();
 
-  if (mState == State::WaitingForTransactionsToComplete ||
-      (mState == State::SendingResults && aWhy != Deletion)) {
-    // We didn't get an opportunity to clean up.  Do that now.
+  // There may be an event in the event queue that would do the cleanup later,
+  // but if we are being destroyed abnormally (not by calling
+  // PBackgroundIDBFactoryRequestParent::Send__delete__) we need to do the
+  // cleanup here and just ignore the cleanup event in FactoryOp::Run.
+  // Otherwise some Database objects may be still alive and registered in
+  // gLiveDatabaseHashtable at the time the last factory is destroyed.
+  if (aWhy != Deletion) {
     mState = State::SendingResults;
     IDB_REPORT_INTERNAL_ERR();
     mResultCode = NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;