[iOS] Ensure all search logos render on mini NTP background customization

Previously, third-party logos and doodles were fetched asynchronously.
By the time the fetch completed, the owning SearchEngineLogoMediator
instances were often deallocated, causing the logos to fail to appear in
the camera roll picker, preset gallery, and recent backgrounds.

This change updates the coordinators for each relevant view controller
to hold a strong ivar reference to their logo mediators. This ensures
mediators remain alive until the coordinator itself is deallocated,
rather than being released when the view controllers are deallocated.

Recent background: https://screenshot.googleplex.com/9MRp7QDtRzHfjne

Preset gallery: https://screenshot.googleplex.com/7yPpbWW4Q5wnokk

camera roll: https://screenshot.googleplex.com/829aovAStKYoVLB

Fixed: 437101833

Change-Id: I6966e35150f27bdd5f3b2cbfc370939231c3055a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6845704
Commit-Queue: Pier-Alexandre Bouchard <pabouchard@google.com>
Reviewed-by: Adam Arcaro <adamta@google.com>
Cr-Commit-Position: refs/heads/main@{#1501894}
10 files changed
tree: e1814bed8a4a55d037aa500fe6a3f10338abcaf6
  1. .gemini/
  2. .github/
  3. agents/
  4. android_webview/
  5. apps/
  6. ash/
  7. base/
  8. build/
  9. build_overrides/
  10. buildtools/
  11. cc/
  12. chrome/
  13. chromecast/
  14. chromeos/
  15. codelabs/
  16. components/
  17. content/
  18. crypto/
  19. dbus/
  20. device/
  21. docs/
  22. extensions/
  23. fuchsia_web/
  24. gin/
  25. google_apis/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. net/
  34. pdf/
  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. .cursorignore
  54. .geminiignore
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  71. CRYPTO_OWNERS
  72. DEPS
  73. DIR_METADATA
  74. LICENSE
  75. LICENSE.chromium_os
  76. OWNERS
  77. PRESUBMIT.py
  78. PRESUBMIT_test.py
  79. PRESUBMIT_test_mocks.py
  80. README.md
  81. SECURITY_OWNERS
  82. WATCHLISTS
README.md

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