Reland "Implement ExecuteHttpRequest on Chrome OS"

This is a reland of commit 0d10684dd220aacb639a4a2d5c83b7feacef456f

I've dropped the DCHECK_IS_ON condition as the function and
the enum are required to compile. I could put the body of the
function in a DCHECK_IS_ON block, but I'm not a fan of the
added complexity.

Original change's description:
> Implement ExecuteHttpRequest on Chrome OS
>
> This implements the Chrome OS side of ExecuteHttpRequest which handles
> HTTP requests on behalf of DriveFS. This is mostly a simple bridge,
> between DriveFS's HttpDelegate and a URLLoader.
>
> Bug: b:201774934
> Change-Id: Ia497a8b76eabceca0566dd4dc1644b8ad8c17ae3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3583027
> Commit-Queue: Travis Lane <travislane@google.com>
> Reviewed-by: Peter Marshall <petermarshall@chromium.org>
> Reviewed-by: Austin Tankiang <austinct@chromium.org>
> Reviewed-by: Sam McNally <sammc@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1001316}

Bug: b:201774934
Change-Id: I35663882961dd85c8276171ee25643c1097dca53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3637119
Commit-Queue: Travis Lane <travislane@google.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1003759}
7 files changed
tree: 895efc5ee95f93df450f15f68648e2b198cd4751
  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. fuchsia_webengine/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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The project's web site is https://www.chromium.org.

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Documentation in the source is rooted in docs/README.md.

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