Revert "PhoneWindowManager: add ability to use EdgeGestureService for system gestures."

This reverts commit 5df39e24b58ee775b5b7b7cb02e2d17a6d7d89bc.

Conflicts:
	core/java/android/provider/Settings.java

Change-Id: I686b6769c5c89c24dcadad71cd43e619e0329c7c
cleanup

Change-Id: I29f4147a81dfa9e86e3dfd4ed6b39468c548b5a2
need this for edge gesture

Change-Id: Ic574bdd4ea97b87366bea5d30c3f1172674a0ae5