GULMutableDictionary: use `dispatch_sync` instead of `async`. (#3322)
GULMutableDictionary: use `dispatch_sync` instead of `async`. (#3322)


firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk