[ios] Move LastUsedFeedForGoodVisits key out of NSUserDefaults

This CL moves LastUsedFeedForGoodVisits out of NSUserDefaults.

The key has been moved in the PrefService. Note that there are two
types of PrefServices, in this case the code was moved in the
PrefService coming from BrowserState which is per account and is
syncable between devices.
Note that this kind of PrefService behaves differently from
NSUserDefaults which is per device (and not per account).

Bug: 1486770
Change-Id: Ia7beacd29e39282f97e1539f195d26b923ef22ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4966482
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Commit-Queue: Federica Germinario <fedegermi@google.com>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Asami Doi <asamidoi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1214770}
4 files changed
tree: c0f50539a25700853e0d70176ab232469ddbcabd
  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. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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