[Notifications] Erase action vector before assignment

The PlatformNotificationData assignment operator implicitly assumes that
the assignee's action vector is empty, which can cause the vector to
grow undesirably after several assignments. This CL fix this issue by
calling std::vector::clear before copying the vector elements.

A test has been added to validate the fix.

Bug: 1228810
Change-Id: I483c5822d9f42d98f9605a2607e292ab700c7e8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4134788
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Gabriel Brito <gabrielbrito@microsoft.com>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1089093}
3 files changed
tree: 1193fa5010622c076bfa37b891aaedd25a09ee4b
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  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. DEPS
  68. DIR_METADATA
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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