Remove unused broken function

Author: julianKatz

pkg/linkcache/cache.go

@@ -54,15 +54,6 @@ func NewListingCache(period time.Duration, dir string) *ListingCache {
 	}
 }
 
-func NewMockListingCache(period time.Duration, dir string) *ListingCache {
-	return &ListingCache{
-		period: period,
-		dir:    dir,
-		links:  newLinkCache(),
-		fs:     &mockFS{},
-	}
-}
-
 // Run starts the cache's background loop. The filesystem is listed and the cache
 // updated according to the frequency specified by the period. It will run until
 // the context is cancelled.