system-web-apps: remove expiring bookmark install finalizer histograms

This CL removes two histograms that were used to investigate bookmark
app (extension-based) install failures:
 - Webapp.InstallResultExtensionError.System.Profiles.Other
 - Webapp.InstallResultExtensionDisabledReason.System.Profiles.Other

The relevant code isn't executed after BMO project launch (which moves
SWA install to web app install finalizer).

Also removes the relevant test code that were solely introduced for
testing these two histograms (see https://crrev.com/c/1915651 ).

Fixed: 1149526,1149527
Change-Id: I195f531d7c7a8cf106ed00662e3231d2d2b12b08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543531
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Jiewei Qian  <qjw@chromium.org>
Auto-Submit: Jiewei Qian  <qjw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828467}
5 files changed
tree: 7b0f7eb8c51d86ea53118c6b0df9341b16c5475f
  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. cloud_print/
  13. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  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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