Merge changes I807608d5,I4ccc56f3,I8aa75851,I09022bb2

* changes:
  Simplify IMMS#startInputOrWindowGainedFocusInternal() part 3/5
  Simplify IMMS#startInputOrWindowGainedFocusInternal() part 2/5
  Simplify IMMS#startInputOrWindowGainedFocusInternal() part 1/5
  Fix a typo in an error message in InputMethodManagerService