[sync] Use task-posting for datatype errors only when needed

Task-posting when reporting errors via DataTypeController is somewhat
arbitrary, as it becomes obvious in unit-tests (see removed TODOs in
this patch).

Instead, the real case where task-posting is needed is
ProxyDataTypeControllerDelegate, whose only purpose is to deal with
cross-sequence propagation of API calls.

The side effect and risk with this patch is that some API calls, such
as `DataTypeController::LoadModels()`, could exhibit a synchronous
behavior for errors. This seems reasonable, because this function
does already report success cases synchronously (also documented
explicitly in the API), and error-handling code in [1] also has some
precedents for synchronous codepaths.

[1] https://source.chromium.org/chromium/chromium/src/+/main:components/sync/service/model_load_manager.cc;l=295;drc=87c3217dc3fec0f441b68f33d339b7f3a707b11d

Change-Id: I5d1d65e4ffedc3ff9a54f6722ddbc6ac0db4411c
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6394376
Reviewed-by: Mahmoud Rashad <mmrashad@google.com>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1438100}
3 files changed
tree: 1272613cf7ca4af02d6cf005780192d9d1067c12
  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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