Cherry pick: Revert "hide the input method window when the user is done typing"

Upstream bug description:
BUG=340100
Review URL: https://codereview.chromium.org/197763002
Committed:
https://src.chromium.org/viewvc/chrome?view=rev&revision=256750

BUG: b/11157219
Change-Id: I544a36717b8dcdf715d2ab7c3de20ae0d788c1fa
2 files changed