Inline InputMethodUtils#getStringForUser

With my previous commit [1], we can safely inline

  InputMethodUtils#getStringForUser(),

which is used in only one place.

 [1]: I1a9a09655bd63fc5d8cd1811f82c04001d21c22d

Bug: 309837937
Test: presubmit
Change-Id: Ie621bedbe2ce65d14d5d49d612828aea2606084c
1 file changed