Revert "Receiving a broadcast message when home screen is ready."

Revert submission 16169565-b/199120420

Reason for revert: Breaking Build (b/207471332)
Reverted Changes:
Ibc101a249:Receiving a broadcast message when home screen is ...
I18628552a:Sending broadcast message when home screen is read...

Change-Id: Ie985295c7a643c6243f8025eaf007a882b651546
diff --git a/src/com/android/settings/FallbackHome.java b/src/com/android/settings/FallbackHome.java
index 6dfc3d3..40867aa 100644
--- a/src/com/android/settings/FallbackHome.java
+++ b/src/com/android/settings/FallbackHome.java
@@ -41,7 +41,6 @@
 import java.util.Objects;
 
 public class FallbackHome extends Activity {
-    public static final String HOME_IS_READY = "com.android.launcher3.HOME_IS_READY";
     private static final String TAG = "FallbackHome";
     private static final int PROGRESS_TIMEOUT = 2000;
 
@@ -100,9 +99,7 @@
         }
         getWindow().getDecorView().setSystemUiVisibility(flags);
 
-        IntentFilter iFilter = new IntentFilter();
-        iFilter.addAction(HOME_IS_READY);
-        registerReceiver(mReceiver, iFilter);
+        registerReceiver(mReceiver, new IntentFilter(Intent.ACTION_USER_UNLOCKED));
         maybeFinish();
     }