Fangrui Song dd405f1a53 Revert D83834 "Add test utility 'extract'"
This reverts commit d054c7ee2e9f4f98af7f22a5b00a941eb919bd59.

There are discussions about the utility name, its functionality and user interface.
Revert before we reach consensus.
2020-07-28 13:26:33 -07:00
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