This CL mechanically moves RemoteInputConnectionImpl from
com.android.internal.inputmethod
to
android.view.inputmethod
just to make it a package-private class, as it is (and should be) used
only by InputMethodManager.
This is a mechanical refactoring. There must be no developer
observable behavior change in this CL.
Bug: 192412909
Test: presubmit
Change-Id: I2d9bd4a5cb39d506a70331c9c930a74580cdbfa0