Remove obsolete context menu metrics

Those histograms were linked with a feature
AutofillShowManualFallbackInContextMenu that was cleaned up. PM agreed
on removing these metrics, and histogram owner will review the CL.

Further consequences of removing the histograms:
- AutofillField::was_context_meny_shown_ was removed.
- OnContextMenuShownOnField was removed from multiple classes.

OBSOLETE_HISTOGRAM: All removed histograms were linked to a removed
experiment.

Bug: 324029575
Change-Id: If5494ca922914f2f5c847915d865c4752e7dbeb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5339839
Reviewed-by: Jan Keitel <jkeitel@google.com>
Commit-Queue: Jihad Hanna <jihadghanna@google.com>
Reviewed-by: Vidhan Jain <vidhanj@google.com>
Cr-Commit-Position: refs/heads/main@{#1268387}
19 files changed
tree: 330a60c95474178d3265cde5f5475df1a8750f4c
  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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