Remove IMMS#MSG_BIND_INPUT

This CL inlines

  InputMethodManagerService#MSG_BIND_INPUT

handler as it has always been executed from the calling thread.

There should be no observable behavior change.

Bug: 215609403
Test: presubmit
Change-Id: Iab2c7f3bb3b41064359ea4100622e516670bfffc
1 file changed