Hard Removal of LocalTansport#dataManagementLabel.

This API was soft removed in R and hence moves to hard-removal in S.

Fixes: b/134661849
Test: atest CtsBackupTestCases
Test: atest CtsBackupHostTestCases
Change-Id: If2b0165b54e9f85bf458dd9f7ce81f3395f15141

packages/LocalTransport/src/com/android/localtransport/LocalTransport.java

@@ -143,11 +143,6 @@ public class LocalTransport extends BackupTransport {
         return null;
     }
 
-    /** @removed Replaced with dataManagementIntentLabel in the API */
-    public String dataManagementLabel() {
-        return TRANSPORT_DATA_MANAGEMENT_LABEL;
-    }
-
     @Override
     @Nullable
     public CharSequence dataManagementIntentLabel() {