[ios] Remove prefs deprecated in 02/2024 from browserPrefs

This CL removes code cleaning-up the following keys:
 - kIosPromosManagerImpressions
 - prefs::kIosLatestMostVisitedSites
 - "TimestampAppLaunchedOnColdStart"

This Cl also updates tests checking the migration of key
kIosLatestMostVisitedSites.

Bug: none
Change-Id: I0766e168cea629955c153188d92480eae5d10583
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6235268
Reviewed-by: Mark Cogan <marq@chromium.org>
Auto-Submit: Federica Germinario <fedegermi@google.com>
Commit-Queue: Federica Germinario <fedegermi@google.com>
Cr-Commit-Position: refs/heads/main@{#1417228}
NOKEYCHECK=True
GitOrigin-RevId: 4ec79c9f4678dabe4c902ea00b1e22c7100a1464
2 files changed
tree: 102d3ac1ec52f53b25de233ed96e1c7bbbfde7b1
  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.