API CHANGE: rename BackupHelperAgent => BackupAgentHelper per API Council

Part of bug #2545514

Change-Id: Ic775e3b942c485252149c1b6c15c88517fa4e3e5
diff --git a/services/java/com/android/server/SystemBackupAgent.java b/services/java/com/android/server/SystemBackupAgent.java
index 86b9df6..fff1874 100644
--- a/services/java/com/android/server/SystemBackupAgent.java
+++ b/services/java/com/android/server/SystemBackupAgent.java
@@ -21,7 +21,7 @@
 import android.app.backup.BackupDataInputStream;
 import android.app.backup.BackupDataOutput;
 import android.app.backup.BackupHelper;
-import android.app.backup.BackupHelperAgent;
+import android.app.backup.BackupAgentHelper;
 import android.content.Context;
 import android.os.ParcelFileDescriptor;
 import android.os.ServiceManager;
@@ -34,7 +34,7 @@
 /**
  * Backup agent for various system-managed data, currently just the system wallpaper
  */
-public class SystemBackupAgent extends BackupHelperAgent {
+public class SystemBackupAgent extends BackupAgentHelper {
     private static final String TAG = "SystemBackupAgent";
 
     // These paths must match what the WallpaperManagerService uses