Migrating to android-x

Change-Id: I9a774152d13a541e8496dd84f2469bfed407f86d
diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index 19aa795..fe9f901 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -31,7 +31,6 @@
 import android.os.Looper;
 import android.os.Process;
 import android.os.UserHandle;
-import android.support.annotation.Nullable;
 import android.text.TextUtils;
 import android.util.Log;
 import android.util.Pair;
@@ -74,6 +73,8 @@
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.Executor;
 
+import androidx.annotation.Nullable;
+
 /**
  * Maintains in-memory state of the Launcher. It is expected that there should be only one
  * LauncherModel object held in a static. Also provide APIs for updating the database state