[waffle]Cleanup SearchEngineChoiceTrigger feature flag

The SearchEngineChoiceTrigger feature flag is now enabled by default.

We clean up the related code while keeping the
kSearchEngineChoiceTrigger feature flag because it is
needed for the kSearchEngineChoiceTriggerRepromptParams feature param.

This change focuses on Desktop platforms and modifies easy to fix iOS
and android files.

We don't touch the code in `IsChoiceScreenFlagEnabled` and related
calls as they will be handled in b/318824817.

We don't modify test code related to the DSE sync behavior. It will be
handled in b/341011768.

Bug: b:342387270
Change-Id: I267faf763b344e496030e886ec95dff89dfdd911
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5811763
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Nicolas Dossou-Gbété <dgn@chromium.org>
Commit-Queue: Jack Yammine <jyammine@google.com>
Cr-Commit-Position: refs/heads/main@{#1350840}
34 files changed
tree: 34a16cb2bffc5f389ac4215ad392ae567c20a3c6
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. google_update/
  24. gpu/
  25. headless/
  26. infra/
  27. ios/
  28. ipc/
  29. media/
  30. mojo/
  31. native_client_sdk/
  32. net/
  33. pdf/
  34. ppapi/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitallowed
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. CPPLINT.cfg
  70. CRYPTO_OWNERS
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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