Updated origin for captive portal detection

This changes the URL used for captive portal detection from
http://www.gstatic.com/generate_204 to
http://connectivitycheck.gstatic.com/generate_204

The change is necessary to allow for deploying HTTPS DNS records for
www.gstatic.com which is used for a lot of web resources. The
connectivitycheck domain is dedicated for captive portal detection and
already in use by Android and Chromecast.

The teams that own and run both origins have been consulted and have
approved the change.

The actual change is in components/captive_portal/core.

The rest of the changes are to switch from using a global static string
to a static method that can leverage the field trial support to
slowly roll out the change.

Bug: 383118221
Change-Id: I2332c3d90a6f6c69dff8189c674b506119b4a27e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6775730
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Patrick Meenan <pmeenan@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1497637}
21 files changed
tree: 65d8afec97754a03f821caf5cca77d7244703658
  1. .github/
  2. agents/
  3. android_webview/
  4. apps/
  5. ash/
  6. base/
  7. build/
  8. build_overrides/
  9. buildtools/
  10. cc/
  11. chrome/
  12. chromecast/
  13. chromeos/
  14. codelabs/
  15. components/
  16. content/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia_web/
  23. gin/
  24. google_apis/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. net/
  33. pdf/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .cursorignore
  53. .geminiignore
  54. .git-blame-ignore-revs
  55. .gitallowed
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. CPPLINT.cfg
  70. CRYPTO_OWNERS
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. SECURITY_OWNERS
  81. WATCHLISTS
README.md

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