Revert "`span`-ification: `mojo::DataPipe[Consumer|Producer]Handle`: New API."

This reverts commit a23daf4f8c65b26a9b883a23e4a862ac1fea5c0a.

Reason for revert: Causing MSAN issues on https://ci.chromium.org/ui/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/43854/test-results?sortby=&groupby=

Original change's description:
> `span`-ification: `mojo::DataPipe[Consumer|Producer]Handle`: New API.
>
> This CL `span`-ifies the APIs in `mojo/public/cpp/system/data_pipe.h`:
>
> * `BeginReadData` and `BeginWriteData` return (via an out parameter)
>   a `span` instead of returning a ptr+size pair.
> * `ReadData` and `WriteData` consume a `span` instead of consuming
>   a ptr+size pair.
>
> This CL adds the new APIs + coverts callers under `//mojo`.
>
> For more details see the design note here:
> https://docs.google.com/document/d/1c4NKpXwpQ9MKK1SbJ4C6MvhXI8-KJZ4jq7N4VHTHJoI/edit?usp=sharing
>
> Bug: 40284755
> Change-Id: I70a7fab6e57eb3481305e82dd504de91042fa881
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5598233
> Auto-Submit: Ɓukasz Anforowicz <lukasza@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Commit-Queue: Daniel Cheng <dcheng@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1313022}

Bug: 40284755
Change-Id: Ifcd3706b24c7842d4bba7065a625b5b3ec9739b4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5619490
Owners-Override: Darren Shen <shend@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313154}
11 files changed
tree: ba895014ec6b3e013ae2b95aad0438ca27a87c5c
  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. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  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. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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