remove unused

weed/filer/filechunk_group.go

@@ -10,7 +10,6 @@ import (
 
 type ChunkGroup struct {
 	lookupFn     wdclient.LookupFileIdFunctionType
-	chunkCache   chunk_cache.ChunkCache
 	sections     map[SectionIndex]*FileChunkSection
 	sectionsLock sync.RWMutex
 	readerCache  *ReaderCache
@@ -19,7 +18,6 @@ type ChunkGroup struct {
 func NewChunkGroup(lookupFn wdclient.LookupFileIdFunctionType, chunkCache chunk_cache.ChunkCache, chunks []*filer_pb.FileChunk) (*ChunkGroup, error) {
 	group := &ChunkGroup{
 		lookupFn:    lookupFn,
-		chunkCache:  chunkCache,
 		sections:    make(map[SectionIndex]*FileChunkSection),
 		readerCache: NewReaderCache(32, chunkCache, lookupFn),
 	}