war file does not compile after pull request #5359 was merged

[pdurbin]

After pull request #5359 was merged, Travis started reporting

dataverse: Compilation failure [ERROR] /home/travis/build/IQSS/dataverse/src/main/java/edu/harvard/iq/dataverse/FileDownloadHelper.java:[307,58] cannot find symbol

Screenshots from https://travis-ci.org/IQSS/dataverse/builds/468092431