[sync] Remove WipeModelUponSyncDisabledBehavior::kOnceIfTrackingMetadata

See linked bug for detailed background and rationale. The TL;DR is that
this codepath is quite risky, hard to maintain and benefits a very small
number of iOS users. It is time to clean it up, as the consequences for
the few users affected are not too bad either (potential duplication of
data, that they can presumably fix using the available batch upload
flows).

OBSOLETE_HISTOGRAM[Sync.DataTypeClearedOnce]=Logic cleaned up

Change-Id: I9443ae55d5aea15075ceb5a155c739ba22bcce8b
Fixed: 393165673
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6218787
Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1415455}
NOKEYCHECK=True
GitOrigin-RevId: 3d18ea1eef40e96a38d6b593c31a7d3694c6f1fe
3 files changed
tree: b3bb85c7bb102d9a7c3282079bb6fd8e347c8272
  1. build/
  2. chrome/
  3. components/
  4. google_internal/
  5. intents/
  6. net/
  7. public/
  8. testing/
  9. third_party/
  10. tools/
  11. web/
  12. web_view/
  13. .swift-format
  14. BUILD.gn
  15. COMMON_METADATA
  16. DEPS
  17. DIR_METADATA
  18. features.gni
  19. OWNERS
  20. PRESUBMIT.py
  21. PRESUBMIT_test.py
  22. README.md
README.md

This directory holds code related to Chrome for iOS. See this document for a description of the structure underneath this directory.