message: Remove third_party/ prefixes.
  Closes
diff: @@ -59,14 +59,14 @@ filegroup(
  "**/OWNERS",
  ],
  ),
  - visibility = ["//third_party/tensorflow:__subpackages__"],
  + visibility = ["//tensorflow:__subpackages__"],
  )
  ```
  * When adding new BUILD file, add this line to `tensorflow/BUILD` file into `all_opensource_files` target.
  ```
  -"//third_party/tensorflow/<directory>:all_files",
  +"//tensorflow/<directory>:all_files",
  ```
  * For all Python BUILD targets (libraries and tests) add next line:
  