[Start Surface] Remove START_SURFACE_REFACTOR flag

Start Surface Refactor launched in M121 and now that M122 is stable it
is safe to cleanup.

This CL removes the START_SURFACE_REFACTOR flag. However, it does not
remove any code associated with the refactor. Most of the code changed
by the refactor is still behind the method
ReturnToChromeUtils#isStartSurfaceRefactorEnabled. That method now
always returns true. Over time we can then remove references to that
method from the codebase in small pieces.

This CL does cleanup a large number of tests that previously used
the refactor flag.

Skip flakiness check because too many tests names are changed due to
dropping RefactorEnabled/Disabled leading to timeouts.

Note to sheriffs. If any of the tests changed in this CL flake just
disable the test and assign to me. I'll look at it.

Validate-Test-Flakiness: skip
Bug: 327399884
Change-Id: I18a3f60d5a964bd0c679b72efb726c3504ada92e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5332655
Reviewed-by: Xi Han <hanxi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1266683}
30 files changed
tree: a960ae934ddec9d1a8a29a25744c118013cbc79d
  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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