message: Remove `explicit` keyword from snapshot_util Reader/Writer constructors.
diff: @@ -82,7 +82,7 @@ class Writer {
  // Writes snapshots with the standard TFRecord file format.
  class TFRecordWriter : public Writer {
  public:
  - explicit TFRecordWriter(const std::string& filename,
  + TFRecordWriter(const std::string& filename,
  const std::string& compression_type);
  Status WriteTensors(const std::vector<Tensor>& tensors) override;
  @@ -114,8 +114,7 @@ class CustomWriter : public Writer {
  static constexpr const char* const kWriteCord = "WriteCord";
  static constexpr const char* const kSeparator = "::";
  - explicit CustomWriter(const std::string& filename,
  - const std::string& compression_type,
  + CustomWriter(const std::string& filename, const std::string& compression_type,
  const DataTypeVector& dtypes);
  Status WriteTensors(const std::vector<Tensor>& tensors) override;
  @@ -192,8 +191,7 @@ class Reader {
  // Reads snapshots previously written with `TFRecordWriter`.
  class TFRecordReader : public Reader {
  public:
  - explicit TFRecordReader(const std::string& filename,
  - const string& compression_type,
  + TFRecordReader(const std::string& filename, const string& compression_type,
  const DataTypeVector& dtypes);
  Status ReadTensors(std::vector<Tensor>* read_tensors) override;
  @@ -231,9 +229,8 @@ class CustomReader : public Reader {
  static constexpr const char* const kReadCord = "ReadCord";
  static constexpr const char* const kSeparator = "::";
  - explicit CustomReader(const std::string& filename,
  - const string& compression_type, const int version,
  - const DataTypeVector& dtypes);
  + CustomReader(const std::string& filename, const string& compression_type,
  + const int version, const DataTypeVector& dtypes);
  Status ReadTensors(std::vector<Tensor>* read_tensors) override;
  