[image_service] Remove fetching of images from QueryClustersState

This CL deletes a code path where Chrome fetches salient image URLs
in the C++ handler. (In QueryClustersState specifically).

We tried this as a prototype, but it has a few disadvantages:

 1. It delays sending the Journeys to the DOM, and overall makes
    the latency of painting the Journeys themselves onto the page
    worse.

 2. It prevents the UI from being smart and only requesting images
    once the actual Journey is displayed on-screen.

 3. It's not scalable to NTP Quests or Bookmarks++, because it forces
    frontend devs to write bespoke asynchronous C++ to do it.

We plan to implement this as a Typescript BrowserProxy instead.

Bug: b/244507194, 1367485, b/248367751
Change-Id: I383cb68701b939b0c79b0117698a45435573e8a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4257393
Reviewed-by: Patrick Noland <pnoland@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1106299}
10 files changed
tree: a9d43d6a32be211143a0af8f71df6b6cf68bb1ef
  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. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  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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