[Start] Revert new home surface for Finale.

Revert CLs for new home surface:
1. http://crrev/c/2657865
2. http://crrev/c/2716143

Revert CLs for about_flags:
1. http://crrev/c/2716177
2. http://crrev/c/2716917
3. http://crrev/c/2976771

This CL reverts the about_flags and implementation of Finale new home
surface in the above two CLs. Other changes in those CLs, e.g. the tab
switcher button on the homepage are kept.
StartSurfaceConfiguration#NEW_SURFACE_FROM_HOME_BUTTON is used by other features (focus omnibox on the new tab) and will be cleaned up in the
followup CLs.

Bug: 1332579
Change-Id: I8c561af80b7f98a74e3d10f9f6caa34bc9e10d4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3688678
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Commit-Queue: Hao Dong <spdonghao@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1011449}
6 files changed
tree: e7cac251f16ae9058d604e6b89bff9287c1237b2
  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/
  22. fuchsia_web/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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