[WhatsNew] Clean up primary action handler

This CL adds an enum for each primary action available in What's New.
This will allow us to set the enum directly in the plist and avoid adding updating the primary action handler.

Low-Coverage-Reason: The changes are just a cleanup. Test coverage for whats_new_mediator.mm should be added in a different CL.
Bug: b/299315839
Change-Id: I44cc3dd19665391e688c76cf54bcf3823e5d1003
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4871901
Commit-Queue: Cheick Cisse <cheickcisse@google.com>
Reviewed-by: Gayane Petrosyan <gayane@google.com>
Cr-Commit-Position: refs/heads/main@{#1202001}
10 files changed
tree: 713bae1d30cf13d7c75d02581894d7371d5b6e59
  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. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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