Revert "Add proto flag "javanano_use_deprecated_package" to avoid build breakage"

This reverts commit cb7674118c6fa6849e657fb8fea25c8fd93477cc.

Change-Id: I831abe3746be49fd164046655e8c5e059bae074f
diff --git a/protos/backup.proto b/protos/backup.proto
index e1af696..f3ad0b6 100644
--- a/protos/backup.proto
+++ b/protos/backup.proto
@@ -18,7 +18,6 @@
 
 package launcher_backup;
 
-option javanano_use_deprecated_package = true;
 option java_package = "com.android.launcher3.backup";
 option java_outer_classname = "BackupProtos";