Update stale menu artifacts after removing bookmarks

The App Menu only builds the "Bookmarks" title and separator when there are nodes below it to display, and the "other" bookmarks folder adds a separator when it has children.

These artifacts were never updated when a bookmark is removed. The changes are only reflected when the menu is re-opened.
Recording: https://screenshot.googleplex.com/575hYY95S9xcHQp

After this CL, the artifacts are updated immediately, without needing to reopen the menu.
Recording: https://screenshot.googleplex.com/3GGXeVkdnpajkoL

Change-Id: I5cdc8cfb2f9da050f2eaa8581e2d3465471e7f7e
Bug: 382711086, 40868588
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6084666
Reviewed-by: Emily Shack <emshack@chromium.org>
Reviewed-by: Darryl James <dljames@chromium.org>
Commit-Queue: Kaan Alsan <alsan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1394970}
3 files changed
tree: 14804742a84f87e27bfc59bb44efcef925aeebb9
  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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