Migrate NetErrorTabHelper to TabFeatures

Migrates NetErrorTabHelper from WebContentsUserData and
TabHelpers::AttachTabHelpers to UnownedUserData owned by desktop and
Android TabFeatures.

Bug: 540709814
Agent-Generated: true
Change-Id: Ic676c98e79c44288b685fd3b5e5441e2ea482074
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8475716
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1707499}
13 files changed
tree: 3a2316dfb314e78d5007ad9032e719be46f052b6
  1. .agents/
  2. .claude/
  3. .gemini/
  4. .github/
  5. agents/
  6. android_webview/
  7. apps/
  8. ash/
  9. base/
  10. build/
  11. build_overrides/
  12. buildtools/
  13. cc/
  14. chrome/
  15. chromecast/
  16. chromeos/
  17. codelabs/
  18. components/
  19. content/
  20. crypto/
  21. dbus/
  22. device/
  23. docs/
  24. extensions/
  25. fuchsia_web/
  26. gin/
  27. google_apis/
  28. gpu/
  29. headless/
  30. infra/
  31. ios/
  32. ipc/
  33. media/
  34. mojo/
  35. net/
  36. pdf/
  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. webkit/
  52. .clang-format
  53. .clang-tidy
  54. .clangd
  55. .cursorignore
  56. .geminiignore
  57. .git-blame-ignore-revs
  58. .gitallowed
  59. .gitattributes
  60. .gitignore
  61. .gitmodules
  62. .gn
  63. .mailmap
  64. .rustfmt.toml
  65. .yapfignore
  66. ATL_OWNERS
  67. AUTHORS
  68. BRANCH_FEATURE_OWNERS
  69. BRANCH_OWNERS
  70. BUILD.gn
  71. CODE_OF_CONDUCT.md
  72. codereview.settings
  73. CPPLINT.cfg
  74. CRYPTO_OWNERS
  75. DEPS
  76. DIR_METADATA
  77. LICENSE
  78. LICENSE.chromium_os
  79. OWNERS
  80. package.json
  81. PRESUBMIT.py
  82. PRESUBMIT_test.py
  83. PRESUBMIT_test_mocks.py
  84. README.md
  85. SECURITY_OWNERS
  86. vpython.toml
  87. vpython.toml.uv.lock
  88. WATCHLISTS
README.md

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