* Remove `BraveFirstRunFlowSequencer` class
The sequencer only delays `initializeViews()` (the method called when
the callback is fired) until the account/child-status checks finish.
It does not influence which onboarding steps run or any prefs.
Given the current code, we can remove `BraveFirstRunFlowSequencer`
completely and simply call `initializeViews()` directly in both
`WelcomeOnboardingActivity` and `BraveVpnSupportActivity`.
The behavior will remain be the same, just without that async wait.
* Apply code formatting
Simone Arpe
dc9f1c0859