message: Removed unused dependencies, converted everything to proto-lite.
  Pruned dependencies that weren't used:
  //util/gtl:node_hash_map
  //util/gtl:singleton
  GitOrigin-RevId:
diff: #ifndef TINK_UTIL_PROTOBUF_HELPER_H_
  #define TINK_UTIL_PROTOBUF_HELPER_H_
  -// copybara:replace_start
  -// Keep synchronized with google3/third_party/tink/copybara/cc.bara.sky
  -#ifdef PROTOBUF_INTERNAL_IMPL
  -
  -#include "net/proto2/public/message.h"
  -
  -namespace portable_proto = ::proto2;
  -
  -#else
  -// copybara:replace_end
  -
  -#include "google/protobuf/message.h"
  +#include "google/protobuf/message_lite.h"
  namespace portable_proto = ::google::protobuf;
  -#endif // PROTOBUF_INTERNAL_IMP
  -
  #endif // TINK_UTIL_PROTOBUF_HELPER_H_
  