[DO NOT MERGE] Revert "Fix flickering when switched to the task without IME shown"

This reverts commit 7d9eb2b6.

Reason for revert: Regression happens in "com.instagram.android" that IME will cover the comment fields

Bug: 195385541
Bug: 192337037
Bug: 194746204
Change-Id: Id33459ab4f53f8bec2027759302dafc1a4f02fae