[Extensions MV2] Disallow loading unsupported MV2 extensions

Chrome has announced that MV2 extensions will gradually no longer be
supported in the browser. See more information at
https://developer.chrome.com/blog/resuming-the-transition-to-mv3.

Disallow users from loading unsupported MV2 extensions in the final
phase of the deprecation, in which MV2 extensions are no longer
supported. This is implemented by expanding the
StandardManagementPolicyProvider, which is used for other similar cases
(such as extensions blocked by install verification or safe browsing),
and is properly hooked into many different loading paths.

Add new tests exercising the same.

This CL has no production behavior change, as the "unsupported" phase
is still experimental and default-disabled.

Bug: 367395349
Change-Id: Ib9836cd2a43c82ffa5df45546d3794ce01697ac7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5976753
Commit-Queue: Devlin Cronin <rdevlin.cronin@chromium.org>
Reviewed-by: Emilia Paz <emiliapaz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1379262}
7 files changed
tree: c0216ff2048c076f68d56b6b023c8c1139b1e614
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  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. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  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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