@Override
    public void deleteTempFile(final ResourceKey key) {
        final ResourceKey realKey = getRealKey(key);
        if (realKey == null) {
            return;
        }
        resourceStore.deleteTempFile(realKey);
    }
Wrapper for the ResourceStore that makes sure the user can only access stuff
in the session.
stroom-resource/stroom-resource-impl/src/main/java/stroom/resource/impl/SessionResourceStoreImpl.java