[ios] Migrate BookmarkPathCache away from LegacyBookmarkModel

Usage of LegacyBookmarkModel is getting replaced with
bookmarks::BookmarkModel. The specific case of BookmarkPathCache,
tackled in this patch, implies that the bookmark's node ID is sufficient
to uniquely identify a bookmark node, as there is exactly one
BookmarkModel instance (as opposed to having two, which was the case
until recent cleanups).

This also means the second preference, namely
"ios.bookmark.cached_folder_model", becomes unused. It is still kept
around and written to as a safety net and rollback path in case recent code changes run into issues.

On the calling site, in BookmarksHomeViewController,
LegacyBookmarkModel continues to be used as the migration is
complex, to be tackled in future patches. Temporarily, it exercises
LegacyBookmarkModel::underlying_model() to access the underlying
bookmarks::BookmarkModel instance, requiring that the two injected
LegacyBookmarkModel instances share the very same underlying
BookmarkModel (which is guaranteed in practice).

Bug: 346918509
Change-Id: Ife26ea58b35260fae1f38afa4d1cba54d868aa01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5678973
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1324125}
11 files changed
tree: 33eaa11fe05867b115fe3c0640f4c8c1035b6018
  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. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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