message: Remove outdated comment :P
diff: @@ -26,8 +26,6 @@ message GraphDef {
  // compatible, this field is entirely ignored.
  int32 version = 3 [deprecated = true];
  - // EXPERIMENTAL. DO NOT USE OR DEPEND ON THIS YET.
  - //
  // "library" provides user-defined functions.
  //
  // Naming:
  