Implement NativeClientDeviceForceAllowed policy

The old NativeClientForceAllowed policy does not work for ChromeOS -
we need the policy value early during startup, and user policies are not
loaded for some scenarios (login screen, managed guest session).
Instead, implement a new device policy that takes the place of the old
user policy, while deprecating the old policy.

Since the value needs to be present very early in startup, generally
before device policies are loaded, add a second pref that is used to
cache the last known value of the policy. During startup, use this
cached value to potentially re-enable NaCl.
This means that Chrome needs to be restarted once for the policy to be
applied correctly.

Fixed: 374790919
Change-Id: I6cb3d904d1627d18233c7f3e73374ad7c84fbaf8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5988133
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Fabian Sommer <fabiansommer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1380287}
13 files changed
tree: e54c5e5080bccb081bf00f68b6c840272a1b31a6
  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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