Check that a transaction is opened before closing it

chrome/browser/ui/cocoa/notifications/xpc_transaction_handler.mm

Index: chrome/browser/ui/cocoa/notifications/xpc_transaction_handler.mm
diff --git a/chrome/browser/ui/cocoa/notifications/xpc_transaction_handler.mm b/chrome/browser/ui/cocoa/notifications/xpc_transaction_handler.mm
index b1f6b1e73a27583903f8c84e27fac092870240f7..3304373a61f9c81117792201ff13fe4b90e7222e 100644
--- a/chrome/browser/ui/cocoa/notifications/xpc_transaction_handler.mm
+++ b/chrome/browser/ui/cocoa/notifications/xpc_transaction_handler.mm
@@ -35,7 +35,7 @@
     NSUserNotificationCenter* notificationCenter =
         [NSUserNotificationCenter defaultUserNotificationCenter];
     NSUInteger showing = [[notificationCenter deliveredNotifications] count];
-    if (showing == 0) {
+    if (showing == 0 && transactionOpen_) {
       xpc_transaction_end();
       transactionOpen_ = false;
     }