Revert "Enable MessagePort close event"

This reverts commit 848e28c638c0abd5821d53a6d9090082350dde17.

Reason for revert: crbug.com/323695987 concludes that this feature cannot be launched at the current state. This CL will revert it back to test, and be CP-ed into affected releases.

Original change's description:
> Enable MessagePort close event
>
> The close event of MessagePort API is approved, so this CL enables
> MessagePortCloseEvent flag in stable release.
>
> chrome status: https://chromestatus.com/feature/5086799659794432
>
> Bug: 1495616
> Change-Id: If9199f999842c7e90ec7d57d84994e246ac5ed26
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5208673
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Commit-Queue: Nonoka Muraki <murakinonoka@chromium.org>
> Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1249185}

Bug: 1495616,323695987
Change-Id: Ib713595a996c7fb646099d3cdf6cd10d256a3cb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5276821
Auto-Submit: Ming-Ying Chung <mych@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Bo Liu <boliu@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1257595}
7 files changed
tree: c9c92c4e4a2d1f4dcd40fa10ed5a794d8c7f1123
  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_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. DEPS
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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