Remove unused meta argument from LocalStore.Commit

Change-Id: I084ad1cd5b98ebf04bc3dd1bd0679b78c188d9e6
diff --git a/local_store.go b/local_store.go
index b4cae09..ede2946 100644
--- a/local_store.go
+++ b/local_store.go
@@ -63,7 +63,7 @@
 	return nil
 }
 
-func (m *memoryStore) Commit(map[string]json.RawMessage, bool, map[string]data.Hashes) error {
+func (m *memoryStore) Commit(bool, map[string]data.Hashes) error {
 	return nil
 }
 
@@ -211,7 +211,7 @@
 	return os.Create(dst)
 }
 
-func (f *fileSystemStore) Commit(meta map[string]json.RawMessage, consistentSnapshot bool, hashes map[string]data.Hashes) error {
+func (f *fileSystemStore) Commit(consistentSnapshot bool, hashes map[string]data.Hashes) error {
 	isTarget := func(path string) bool {
 		return strings.HasPrefix(path, "targets/")
 	}
diff --git a/repo.go b/repo.go
index 9466cd6..dc1ee26 100644
--- a/repo.go
+++ b/repo.go
@@ -46,7 +46,7 @@
 	// If paths is empty, all staged target files will be walked.
 	WalkStagedTargets(paths []string, targetsFn targetsWalkFunc) error
 
-	Commit(map[string]json.RawMessage, bool, map[string]data.Hashes) error
+	Commit(bool, map[string]data.Hashes) error
 	GetSigningKeys(string) ([]sign.Signer, error)
 	SavePrivateKey(string, *sign.PrivateKey) error
 	Clean() error
@@ -727,7 +727,7 @@
 		return err
 	}
 
-	if err := r.local.Commit(r.meta, root.ConsistentSnapshot, hashes); err != nil {
+	if err := r.local.Commit(root.ConsistentSnapshot, hashes); err != nil {
 		return err
 	}