Revert "[PWA/AppUpdating]: Add update_token as a web_app field"

This reverts commit 799659ad4bf1a128d18c0d2024376a79915d002e.

Reason for revert: update_token is no longer needed since app updates for icons solely depend on icon URL changes. See https://github.com/WICG/manifest-incubations/blob/gh-pages/predictable-app-updating.md for more details. 

Bug: 403252576
Original change's description:
> [PWA/AppUpdating]: Add update_token as a web_app field
>
> This CL adds update_token as a field in the web_app to be stored in the
> web_app_database.
>
> This contributes to implementing a token-based update for predictable
> web app updating. Design doc:
> https://bit.ly/predictable-webapp-updating-prd
>
> Bug: 403252576
> Change-Id: I306eca0dbaf3206ff765393b70463e6058e25937
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6397152
> Reviewed-by: Dibyajyoti Pal <dibyapal@chromium.org>
> Commit-Queue: May Siem <msiem@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1439709}

Bug: 403252576
Change-Id: I60110ca4326fa191628c431bd9fa5ebc80afa480
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6543747
Reviewed-by: Dibyajyoti Pal <dibyapal@chromium.org>
Commit-Queue: May Siem <msiem@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1460859}
7 files changed
tree: 93480ab0773ee764507fd6e588187325a5a63764
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  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. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. SECURITY_OWNERS
  79. WATCHLISTS
README.md

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