refactor(tvix/store): impl Default for MemoryChunkService

Change-Id: If1ceb870e9e5d03b651923a3a786350a8663e990
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8236
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

tvix/store/src/chunkservice/memory.rs

@@ -9,19 +9,11 @@ use crate::Error;
 
 use super::ChunkService;
 
-#[derive(Clone)]
+#[derive(Clone, Default)]
 pub struct MemoryChunkService {
     db: Arc<RwLock<HashMap<Vec<u8>, Vec<u8>>>>,
 }
 
-impl MemoryChunkService {
-    pub fn new() -> Self {
-        let db = Arc::new(RwLock::new(HashMap::default()));
-
-        Self { db }
-    }
-}
-
 impl ChunkService for MemoryChunkService {
     #[instrument(skip(self, digest), fields(chunk.digest=BASE64.encode(digest)))]
     fn has(&self, digest: &[u8]) -> Result<bool, Error> {