Reland "Enable -Wunreachable-code in Chrome OS builds."

This is a reland of 2ff5fdbc7071dbdd8bca67f3cb72cdcb636e543b with
a build fix in code that's only built on some internal bot
(it changes a FAIL() to an ADD_FAILURE() there, but the test still
passes with that). Also enable on arm builds, since the fix for
that has rolled in since the first attempt.

Original change's description:
> Enable -Wunreachable-code in (non-arm) Chrome OS builds.
>
> Bug: 1063529,346399
> Change-Id: I313ebf4cc16885d1f9bdc5a2ed8db524467735f2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116590
> Commit-Queue: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Auto-Submit: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#752618}

TBR=bpastene

Bug: 1063529, 346399
Cq-Include-Trybots: chrome/try:linux-chromeos-chrome
Change-Id: I1dd3cefcaa229b6e2655cee3cd20cf98f32be04b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116912
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752856}
3 files changed
tree: d249e5a677a8f3cd9cf5dac142c52861ecf56370
  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. cloud_print/
  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. jingle/
  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. .vpython
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. ENG_REVIEW_OWNERS
  68. LICENSE
  69. LICENSE.chromium_os
  70. OWNERS
  71. PRESUBMIT.py
  72. PRESUBMIT_test.py
  73. PRESUBMIT_test_mocks.py
  74. README.md
  75. WATCHLISTS
README.md

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

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For historical reasons, there are some small top level directories. Now the guidance is that new top level directories are for product (e.g. Chrome, Android WebView, Ash). Even if these products have multiple executables, the code should be in subdirectories of the product.