Remove unnecesary final keyword from method params in InputMethodUtils

This is a mechanical refactoring to remove "final" keyboard from
method parameters in InputMethodUtils.

There should be no behavior change.

Bug: 123379418
Test: atest CtsInputMethodTestCases CtsInputMethodServiceHostTestCases
Change-Id: Ic33e94f2bdedaa2c573be0857727d901800e5bbf
1 file changed