Revert "Introduce SingleKeyGestureDetector to PhoneWindowManager"

This reverts commit 29f27e8d.

Fixes: 181311329
Bug: 169058831
Bug: 127687575

Reason for revert: DroidMonitor: Potential culprit for 181311329 - verifying through Forrest before revert submission. This is part of the standard investigation process, and does not necessarily mean your CL will be reverted.

Change-Id: Ibebd4a2dcd5016ad2af7da5f296493214e06d171