Remove the layer of task overlay activities

The task overlay activities should be on the same layer as
other activities in the task. It is already ensured to be
on top of other activities by making it always-on-top in wm
hierarchy.

Bug: 262404281
Test: build and presubmit
Change-Id: I0f4123355d711acb3a87e91c9523468f789da154

core/java/android/window/TaskConstants.java

@@ -79,14 +79,6 @@ public class TaskConstants {
      */
     public static final int TASK_CHILD_LAYER_TASK_OVERLAY = 5 * TASK_CHILD_LAYER_REGION_SIZE;
 
-    /**
-     * Legacy machanism to force an activity to the top of the task (i.e. for work profile
-     * comfirmation).
-     * @hide
-     */
-    public static final int TASK_CHILD_LAYER_TASK_OVERLAY_ACTIVITIES =
-            6 * TASK_CHILD_LAYER_REGION_SIZE;
-
     /**
      * Z-orders of task child layers other than activities, task fragments and layers interleaved
      * with them, e.g. IME windows. [-10000, 10000) is reserved for these layers.
@@ -99,8 +91,7 @@ public class TaskConstants {
             TASK_CHILD_LAYER_LETTERBOX_EDUCATION,
             TASK_CHILD_LAYER_WINDOW_DECORATIONS,
             TASK_CHILD_LAYER_RECENTS_ANIMATION_PIP_OVERLAY,
-            TASK_CHILD_LAYER_TASK_OVERLAY,
-            TASK_CHILD_LAYER_TASK_OVERLAY_ACTIVITIES
+            TASK_CHILD_LAYER_TASK_OVERLAY
     })
     public @interface TaskChildLayer {}
 }