Removes CarTestManagerBinderWrapper from System API.

Bug: b/129802834
Fixes: b/129802834
Test: refactoring CL

Change-Id: Ib722508c637028be4a3664f303e508be9f2233e3
diff --git a/car-lib/api/system-current.txt b/car-lib/api/system-current.txt
index ed06801..6e94915 100644
--- a/car-lib/api/system-current.txt
+++ b/car-lib/api/system-current.txt
@@ -922,16 +922,6 @@
 
 }
 
-package android.car.test {
-
-  public class CarTestManagerBinderWrapper {
-    ctor public CarTestManagerBinderWrapper(android.os.IBinder);
-    method public void onCarDisconnected();
-    field public final android.os.IBinder binder;
-  }
-
-}
-
 package android.car.trust {
 
   public final class CarTrustAgentEnrollmentManager {
diff --git a/car-lib/src/android/car/test/CarTestManagerBinderWrapper.java b/car-lib/src/android/car/test/CarTestManagerBinderWrapper.java
index 186951e..5e39ea3 100644
--- a/car-lib/src/android/car/test/CarTestManagerBinderWrapper.java
+++ b/car-lib/src/android/car/test/CarTestManagerBinderWrapper.java
@@ -15,7 +15,6 @@
  */
 package android.car.test;
 
-import android.annotation.SystemApi;
 import android.car.CarManagerBase;
 import android.os.IBinder;
 
@@ -23,7 +22,6 @@
  * Only for system testing
  * @hide
  */
-@SystemApi
 public class CarTestManagerBinderWrapper implements CarManagerBase {
     public final IBinder binder;