Chrome Version: 61.0.3115.0 (Official Build) canary (64-bit)

What steps will reproduce the problem?
(1) Create a master_preferences file [1] with the contents
  {
    "variations_compressed_seed": "foo",
    "variations_seed": "bar",
    "variations_seed_signature": "qux"
  }
(2) Launch Chrome
(3) View the contents of Default/Preferences in the User Data Directory [2].

What is the expected result?
  None of these three preferences should be copied over. Any that were copied over in the past should be deleted. The correct location for these preferences is in the Local State.

What happens instead?
  All of these prefs are incorrectly copied over.

[1] https://sites.google.com/a/chromium.org/dev/administrators/configuring-other-preferences
[2] https://www.chromium.org/user-experience/user-data-directory