The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8f5c9061ce04e39895c79a07ee9b949838dfdaca

commit 8f5c9061ce04e39895c79a07ee9b949838dfdaca
Author: Yuki Awano <yawano@chromium.org>
Date: Wed Jan 09 01:23:07 2019

Disable ChromeVox logging options by default

  options are disabled by default.

Bug: 919757
Test: Open ChromeVox options page and confirm that all ChromeVox logging
Change-Id: Ib143b77706fb4e4c312352f2ea6639030648522c
Reviewed-on: https://chromium-review.googlesource.com/c/1399779
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Yuki Awano <yawano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620979}
[modify] https://crrev.com/8f5c9061ce04e39895c79a07ee9b949838dfdaca/chrome/browser/resources/chromeos/chromevox/chromevox/background/prefs.js