Assign the default app before posting notifications. (#2024)
Assign the default app before posting notifications. (#2024)

Although SDKs being configured should access the app through the
dictionary being passed in (and soon the `FIRCoreConfigurable`
protocol), the default app should be assigned before notifying SDKs
that Core is ready.
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