Use clear-all recent tasks call

Change-Id: I1c93bffa0573d0a37a86b62f5a7ec948ac11799e
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index 20f7cdb..f3dec9a 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -995,10 +995,8 @@
         mPendingAnimation = pendingAnimation;
         mPendingAnimation.addEndListener((onEndListener) -> {
             if (onEndListener.isSuccess) {
-                int taskViewCount = getTaskViewCount();
-                for (int i = 0; i < taskViewCount; i++) {
-                    removeTask(getTaskViewAt(i).getTask(), -1, onEndListener, false);
-                }
+                // Remove all the task views now
+                ActivityManagerWrapper.getInstance().removeAllRecentTasks();
                 removeAllViews();
                 onAllTasksRemoved();
             }