Revert "HeadsUp: Fix dismiss on back key press."

This reverts commit 2aa1c08.

Author: codex-corp

packages/SystemUI/src/com/android/systemui/statusbar/policy/HeadsUpNotificationView.java

@@ -22,7 +22,6 @@
 import android.graphics.Rect;
 import android.util.AttributeSet;
 import android.util.Log;
-import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewConfiguration;
@@ -229,19 +228,6 @@ public void onChildDismissed(View v, boolean direction) {
         mBar.onHeadsUpDismissed(direction);
     }
 
-    @Override
-    public boolean dispatchKeyEvent(KeyEvent event) {
-        boolean down = event.getAction() == KeyEvent.ACTION_DOWN;
-        switch (event.getKeyCode()) {
-            case KeyEvent.KEYCODE_BACK:
-                if (!down && !event.isCanceled()) {
-                    mBar.hideHeadsUp();
-                }
-                return true;
-        }
-        return super.dispatchKeyEvent(event);
-    }
-
     @Override
     public void onChildTriggered(View v) {
     }