Create a File Based Encryption check API

Change-Id: Ibf41f98818ea801b9f690200c340be80c3b9bf31
diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index c41d493..621ae2d 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -404,7 +404,7 @@
     @Override
     public int getCredentialOwnerProfile(int userHandle) {
         checkManageUsersPermission("get the credential owner");
-        if (!"file".equals(SystemProperties.get("ro.crypto.type", "none"))) {
+        if (!mContext.getSystemService(StorageManager.class).isPerUserEncryptionEnabled()) {
             synchronized (mUsersLock) {
                 UserInfo profileParent = getProfileParentLU(userHandle);
                 if (profileParent != null) {