[Code Health] base::Value cleanup after PrefService refactor

https://crrev.com/c/3343526 recently landed as a LSC, which
refactored the PrefService GetList() and GetDictionary() methods.
The blast radius of this interface was quite large, so bare minimum
changes were made at call sites.

This CL is part of an effort to clean up these call sites.

The unsplit version of this CL can be found at
https://crrev.com/c/3351044

base::Value refactor guidelines:
http://doc/1CwYuMXnVQsRsghwVzEkWj9GZzfERputSLQaKx5xLhjQ

This CL was uploaded by git cl split.

R=mxcai@chromium.org

Bug: 1187001, 1187061, 1187062
Change-Id: I5fdceb96f0d218653d41d24db8a808c6d02ff0a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3353290
Auto-Submit: Austin Sullivan <asully@chromium.org>
Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Austin Sullivan <asully@chromium.org>
Cr-Commit-Position: refs/heads/main@{#954246}
2 files changed
tree: a5aff8397be47320e8389a74dd91f42189af64d3
  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
README.md

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