Revert "HeadsUp: option to launch in floating window (1/2)"

This reverts commit 2139e140349b08697c8df7408c3c0ceb34849e46.

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/notification/NotificationHelper.java

Change-Id: If631493bcf2e8881e10bc1c434d990dee6b8eee8
Revert "HeadsUp: User configurable timeout (1/2)"

This reverts commit 533d498aac2e41b00efaf9c53cf9e244f1491663.
Revert "HeadsUp: Launch in floating window"

This reverts commit 33c46c37e89a97dd944fffc188d8ff09f4815dce.