Revert "Completely destroy Launcher's Taskbar."

Revert submission 28102205

Reason for revert: Potential test breakage.

Reverted changes: ag/28102205

Change-Id: If7fa1ff192a240e753e5c245d591d46e594e5a6f
Flag: TEST_ONLY
Bug: 230027385
Test: Presubmit
2 files changed