[Sync] Use GaiaId instead of CoreAccountId in activation request

CoreAccountId currently contains Gaia ID, hence the migration should be
nearly no-op on most clients. Few clients which did not complete the
migration to Gaia ID should not have behavioral changes, because the
serialized value is replaced on browser startup with a new value in sync
metadata.

This migration is needed to avoid CoreAccountId serialization because it
may change over time, while GaiaId is more stable.

In this CL in some data type tests (e.g. ReadingList) the new GaiaId is
compared against CoreAccountId. This will be changed in follow-up CLs
where their models will return GaiaId instead.

Bug: 383089506
Change-Id: Ica4321eae4d765861153f4d8149d540154cb38d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6468934
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/main@{#1450390}
20 files changed
tree: ff639a478f86bab772ba9feb5aed057b5f3f01f5
  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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