Revert "Avatars: update default avatar caching and user pref"

This reverts commit 1489c297bbe95db4f33161ab9a89927861bd2f45.

Reason for revert: UserImageManagerPolicyTest.PolicyOverridesUser and SaveUserDefaultImageIndex are failing on linux-chromeos-chrome and linux-chromeos-rel
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-rel/60732

Original change's description:
> Avatars: update default avatar caching and user pref
>
> Instead of doing a migration, just strictly gate the caching of default
> avatars behind the feature flag (to avoid the animated encoding issues).
> This means that default avatars will only start being cached after the
> flag rolls out.
>
> Since this method resolves the issue with caching animated images, set
> the ImageCacheUpdated user pref to avoid always re-caching when it's
> unnecessary.
>
> Tests: tested on atlas DUT
> Bug: b/250810109
> Change-Id: Ibc392f9c4d2e92fc275173f918ec0e47f91ea357
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3980638
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Commit-Queue: Angela Xiao <angelaxiao@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1064037}

Bug: b/250810109
Change-Id: Ia3e2720033e4ed4469f4f7de4c4faa2d42b01fa2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3985165
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Owners-Override: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1064111}
1 file changed
tree: cbdb211dbe36f9b30509ac62d53f3b53eda679c9
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. DIR_METADATA
  68. ENG_REVIEW_OWNERS
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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