Change Observer: Fix crash when navigating to new page

The browser may crash if you navigate to a new page with an active
FileSystemObserver observation.

This is because the FileSystemAccessObserverObservation is a
FileSystemAccessPermissionGrant::Observer of the root handle's read
grant. And when the permission status changes, it destroys itself along
with the read grant if its the only holder of the read grant.

This means that when you navigate to a new page, RevokeActiveGrants
attempts to iterate through all the active grants of the page and revoke
them. But since its iterating over an array that
FileSystemAccessObserverObservation removes an element from during that
iteration, it get an invalid iterator.

The fix is to increase the iterator before continuing.

Fixed: 359567614
Change-Id: I3eea7340527e0255bdaa7488cf6e4968b299483e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5786874
Reviewed-by: Daseul Lee <dslee@chromium.org>
Commit-Queue: Nathan Memmott <memmott@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1341696}
2 files changed
tree: a9f48b9d6b0800397905f6c05277fed4a6ddcd84
  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. CRYPTO_OWNERS
  72. DEPS
  73. DIR_METADATA
  74. LICENSE
  75. LICENSE.chromium_os
  76. OWNERS
  77. PRESUBMIT.py
  78. PRESUBMIT_test.py
  79. PRESUBMIT_test_mocks.py
  80. README.md
  81. WATCHLISTS
README.md

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