Use androidx.window from prebuilt.

Use androidx.window prebuilt for consistency.

Bug: 223114509
Test: m -j

Change-Id: Ifeba7d0073ba7aeb6308c186738161c4857a97a3
diff --git a/tests/robotests/Android.bp b/tests/robotests/Android.bp
index ee0a7d8..5891ca3 100644
--- a/tests/robotests/Android.bp
+++ b/tests/robotests/Android.bp
@@ -34,6 +34,7 @@
         "androidx.cardview_cardview",
         "androidx.preference_preference",
         "androidx.recyclerview_recyclerview",
+        "androidx.window_window",
         "com.google.android.material_material",
         "setupcompat",
         "setupdesign",
@@ -50,7 +51,6 @@
         "contextualcards",
         "settings-logtags",
         "zxing-core-1.7",
-        "windowExtLib",
     ],
 
     aaptflags: ["--extra-packages com.android.settings"],