Revert "Fix IMMS#mInputShown state inconsistency."

This reverts commit 8d4a9117fbd0aaf03b8486ef920c73894a12cfcd.

Because of a regression Bug 21161785.

Bug: 21161785
Bug: 18722991
Bug: 20763994
Bug: 20764441
Bug: 20926844
Change-Id: If58612eda08764be0226832c0a73f03683889cdb
1 file changed