Rename Size_ to Size

Previouslty "Size" was reserved by protoc-gen-gogoctrd and user-generated
"Size" was automatically renamed to "Size_" to avoid conflicts.

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

image_store.go

@@ -141,7 +141,7 @@ func imagesFromProto(imagespb []*imagesapi.Image) []images.Image {
 func descFromProto(desc *types.Descriptor) ocispec.Descriptor {
 	return ocispec.Descriptor{
 		MediaType:   desc.MediaType,
-		Size:        desc.Size_,
+		Size:        desc.Size,
 		Digest:      digest.Digest(desc.Digest),
 		Annotations: desc.Annotations,
 	}
@@ -150,7 +150,7 @@ func descFromProto(desc *types.Descriptor) ocispec.Descriptor {
 func descToProto(desc *ocispec.Descriptor) *types.Descriptor {
 	return &types.Descriptor{
 		MediaType:   desc.MediaType,
-		Size_:       desc.Size,
+		Size:        desc.Size,
 		Digest:      desc.Digest.String(),
 		Annotations: desc.Annotations,
 	}