As CL[1] removed InputMethodService#onToggleSoftInput since framework side changed internal protocal to simplify the toggle logic without this method callback. Also remove ClientCallbackImpl#onToggleSoftInput for MultiClientInputMethod sample app part to sync this change. [1]: I390dc029e7bcc30c200926a9bfbbbd0268a1f714 Bug: 182071625 Test: build MultiClientInputMethod Change-Id: I25568d9d0a963562fdc1d4a021f7016689b9ca54