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>

content/proxy/content_reader.go

@@ -38,7 +38,7 @@ func (ra *remoteReaderAt) ReadAt(p []byte, off int64) (n int, err error) {
 	rr := &contentapi.ReadContentRequest{
 		Digest: ra.digest.String(),
 		Offset: off,
-		Size_:  int64(len(p)),
+		Size:   int64(len(p)),
 	}
 	// we need a child context with cancel, or the eventually called
 	// grpc.NewStream will leak the goroutine until the whole thing is cleared.

content/proxy/content_store.go

@@ -217,7 +217,7 @@ func (pcs *proxyContentStore) negotiate(ctx context.Context, ref string, size in
 func infoToGRPC(info *content.Info) *contentapi.Info {
 	return &contentapi.Info{
 		Digest:    info.Digest.String(),
-		Size_:     info.Size,
+		Size:      info.Size,
 		CreatedAt: protobuf.ToTimestamp(info.CreatedAt),
 		UpdatedAt: protobuf.ToTimestamp(info.UpdatedAt),
 		Labels:    info.Labels,
@@ -227,7 +227,7 @@ func infoToGRPC(info *content.Info) *contentapi.Info {
 func infoFromGRPC(info *contentapi.Info) content.Info {
 	return content.Info{
 		Digest:    digest.Digest(info.Digest),
-		Size:      info.Size_,
+		Size:      info.Size,
 		CreatedAt: protobuf.FromTimestamp(info.CreatedAt),
 		UpdatedAt: protobuf.FromTimestamp(info.UpdatedAt),
 		Labels:    info.Labels,