[Private Network Access] Disable preflights by default.

> Merging to 103 from ToT.

Anecdotal reports suggest that in some environments failed preflights
are leading to failed requests. This patch disables the feature while
we continue to investigate.

(cherry picked from commit dd306fb4c706648443386963945650cb344a0b61)

Bug: 1274149, 1329248
Change-Id: Id07fb24398627407ce98c4c6d424cf97242217bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3669044
Commit-Queue: Mike West <mkwst@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1007517}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3672354
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Auto-Submit: Mike West <mkwst@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/branch-heads/5060@{#293}
Cr-Branched-From: b83393d0f4038aeaf67f970a024d8101df7348d1-refs/heads/main@{#1002911}
1 file changed
tree: 77527fe79d3647ee99db2fa9a98d560a865cb136
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. codelabs/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia/
  22. fuchsia_webengine/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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