Follow up of IInputConnectionWrapper

Remove unnecessary methods that incidentally added by CL[1]

[1]:  Ice1ea23dcb2351b56ef03b507d8aec8f8fb7b30a

Bug: 167948374
Bug: 163450598
Bug: 181724627
Test: atest CtsInputMethodTestCases
Change-Id: I230e78aada7b171fa2723bc5a32da991896b4ddd
1 file changed