Revert "Prevent NPE in PulseExpansionHandler"

This reverts commit 14f069b83ced6680a154753e9d944983e60f78a8.

Reason for revert: http://b/156204772

Change-Id: Ie47d41d3d6625d3769005bd46b5dfe20171d5d70
(cherry picked from commit 9a45fe67e97e964e2cb9b2161f3a8a4508a1a52d)
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/PulseExpansionHandler.kt b/packages/SystemUI/src/com/android/systemui/statusbar/PulseExpansionHandler.kt
index 02c98ae..88f148b 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/PulseExpansionHandler.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/PulseExpansionHandler.kt
@@ -121,14 +121,14 @@
     }
 
     override fun onInterceptTouchEvent(event: MotionEvent): Boolean {
-        return canHandleMotionEvent() && startExpansion(event)
+        return maybeStartExpansion(event)
     }
 
-    private fun canHandleMotionEvent(): Boolean {
-        return !wakeUpCoordinator.canShowPulsingHuns || qsExpanded || bouncerShowing
-    }
-
-    private fun startExpansion(event: MotionEvent): Boolean {
+    private fun maybeStartExpansion(event: MotionEvent): Boolean {
+        if (!wakeUpCoordinator.canShowPulsingHuns || qsExpanded ||
+                bouncerShowing) {
+            return false
+        }
         if (velocityTracker == null) {
             velocityTracker = VelocityTracker.obtain()
         }
@@ -177,14 +177,9 @@
     }
 
     override fun onTouchEvent(event: MotionEvent): Boolean {
-        if (!canHandleMotionEvent()) {
-            return false
+        if (!isExpanding) {
+            return maybeStartExpansion(event)
         }
-
-        if (!isExpanding || event.actionMasked == MotionEvent.ACTION_DOWN) {
-            return startExpansion(event)
-        }
-
         velocityTracker!!.addMovement(event)
         val y = event.y