Move COEP to Policy Container

In order to properly support inheritance of COEP within blob, move COEP
in policy container. This also consolidates its inheritance within the
policy container.
Remains specific case where inheritance is handled only for COEP but
not PolicyContainer: Extensions and fenced frames [1]. This was moved
within `void NavigationRequest::ComputePoliciesToCommit()`.
COEP enforcement was added in NavigationRequest::BeginNavigationImpl,
in the cases where an URL loader is not needed. This ensures COEP is
enforced on non-initial about:blank.


[1] https://docs.google.com/document/d/11ICO7dKEjeeJtSHyVitcN5JiOD0uRgvRzyyo3FY0y1c/edit?pli=1&resourcekey=0-bTO8Ltbpfi05Xt4aK-MeEQ#

bug: 1151223
Change-Id: I33a0dd61c257b6927fa335bdd983fb1b393c6177
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3328982
Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Pâris Meuleman <pmeuleman@chromium.org>
Cr-Commit-Position: refs/heads/main@{#959138}
18 files changed
tree: ca142b81311514ccdce5853816a765a26d9ea1ad
  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. cloud_print/
  13. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython
  63. .vpython3
  64. .yapfignore
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  71. ENG_REVIEW_OWNERS
  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
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