Revert "Replace String with WebMessagePayload for AndroidX WebMessage API"

This reverts commit bc7514a7cf7b67ffc3fb0698310a23246df5a7c5.

Reason for revert: Fail the downstream builds

Original change's description:
> Replace String with WebMessagePayload for AndroidX WebMessage API
>
> Design doc: https://docs.google.com/document/d/1nsQnwwY43OuA4PsSaMioiKA0c_M1eV1XX2q15YFA7cI/edit?usp=sharing
>
> This CL did not add new features.
> - Add a new boundary type WebMessagePayload to replace String
> WebMessage.getData().
> - Add new data class MessagePayload in content/, and replace existing
> PostMessage API with the new type.
> - A followup change will add ArrayBuffer support in
> WebViewCompat.postMessageToMainFrame and
> WebChannelCompat.postMessage.
>
> How to test: run tests in existing AndroidX Webkit.
>
> Bug: 1023334
> Change-Id: Ib5b35b974bee597a6efada75503c5288f7058c50
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3583520
> Reviewed-by: Bo Liu <boliu@chromium.org>
> Reviewed-by: Richard Coles <torne@chromium.org>
> Reviewed-by: Peter Conn <peconn@chromium.org>
> Commit-Queue: Linyue He <linyhe@microsoft.com>
> Cr-Commit-Position: refs/heads/main@{#995852}

Bug: 1023334, 1319735
Change-Id: If4f6e38f8392ad4135cd76f6391abe6c248194bd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3607489
Auto-Submit: Zhiyuan Cai <zhiyuancai@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Owners-Override: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#996032}
25 files changed
tree: f09b9d3718219ee3232e01edeb8e117635be069a
  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/
  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. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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