Simplify Cronet native library initialization

The current code that handles Cronet native library initialization and
the init thread is incredibly contrived and confusing, for no apparent
reason. My best guess is that the code ended up in this weird state due
to the combination of these two (very old) CLs:

- https://codereview.chromium.org/1926683003
- https://codereview.chromium.org/2812963002

Basically, when the initialization code was moved from the main thread
to the new init thread, a bunch of defensive code stopped making sense,
but wasn't cleaned up.

This CL makes the initialization code much more straightforward, making
it possible to read this code without triggering massive headaches.

Change-Id: I452a5230b7bf1d0c9f22ccec1491d6f3cf6e705c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5245551
Commit-Queue: Etienne Dechamps <edechamps@google.com>
Reviewed-by: Stefano Duo <stefanoduo@google.com>
Cr-Commit-Position: refs/heads/main@{#1254493}
2 files changed
tree: ac6b9bfcf3dd14cba493dc7e8d2e82dbcb5e71a9
  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. DEPS
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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