Background:
Both SubtypeSwitcher and VoiceConnector have an instance of VoiceInput.
And VoiceConnector has a responsivity for setting VoiceInput to SubtypeSwitcher.
But in case that VoiceInputConnector already has an instance of VoiceInput
VoiceInputConnector doesn't set VoiceInput to SubtypeSwitcher.

Change-Id: I42d0220e7d84a08e03f143213cc6eff87e7e79a6