[Settings] Update site settings to use the method to finish

To support the single-activity mode where a single instance of the
settings activity is used throughout user navigation, settings pages
should use the new method to finish the current fragment.

We used to have GroupedWebsitesActivityHolder that uses WeakReference to
keep track of an activity to finish when the user needs to go back 2
steps, but we have a few problems with it:

- The new API takes a Fragment, not an Activity, to call.
- It is incorrect to use WeakReference in the single-activity mode
  because the same instance of SettingsActivity is shared across
  screens.

Therefore, this patch removes GroupedWebsitesActivityHolder, and instead
modifies GroupedWebsitesSettings to keep track of a paused fragment that
can be retrieved by GroupedWebsitesSettings.getPausedInstance().

Bug: b/356743945
Change-Id: Iad51b4d84354177389876a9c05a6162b80b51b9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5890712
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Shuhei Takahashi <nya@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1361477}
4 files changed
tree: 457ce6947e669c715febbdda9f70531846485c80
  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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