[iOS] Update TabGroupItem to handle removed TabGroup

This CL updates TabGroupItem to handle a situation where the underlying
TabGroup instance has been removed from the WebStateList. Ideally,
TabGroupItem instances should be removed as soon as the underlying group
is deleted but it appears not to always be possible e.g. removing a
TabGroupItem by applying a snapshot that does not contain this item may
trigger callbacks by the UICollectionView in TabStripViewController
which need to read from the data source while the snapshot is being
applied, at which point it is not clear whether the TabGroupItem that is
meant to be removed will be returned by the data source or not.

Change-Id: I91a2178192e7891ab6279a4f762fd4e5cc0bbbc1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5419237
Auto-Submit: Quentin Pubert <qpubert@google.com>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Louis Romero <lpromero@google.com>
Cr-Commit-Position: refs/heads/main@{#1283123}
3 files changed
tree: a359fb3557d2d337b77aab7eeffc6346122b6401
  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. DEPS
  71. DIR_METADATA
  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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