[ios] Remove code deprecated in 04/2024 from browserPrefs

This change removes code migrating keys:
 - kSpotlightLastIndexingVersionKey
 - kSpotlightLastIndexingDateKey

And updates migration code of kMixedContentAutoupgradeEnabled because in
this case the pref was registered with "true" as default value, so
cleaning the pref was resetting it to true. This CL changes the default
value to false and updates the deprecation date of the key.

Change-Id: I0b9e5aea357a1f256e1b567ca0dffdf9c9369f12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6422222
Commit-Queue: Asami Doi <asamidoi@chromium.org>
Reviewed-by: Asami Doi <asamidoi@chromium.org>
Auto-Submit: Federica Germinario <fedegermi@google.com>
Cr-Commit-Position: refs/heads/main@{#1441404}
2 files changed
tree: 258fc6739f50933608418b05de2119b9c421ee05
  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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