Clean up shared label logic

Note that all this code is behind a feature flag. This CL is in an
effort to get the code ready for another rollout attempt.

No behavior changes - purely cosmetic code clean ups:
- Using iterators instead of indices.
- Using ranges algorithms instead of loops.
- Simplifying the interface by returning a
  std::vector<std::u16string_view> instead of a
  std::optional<std::vector<std::u16string>>. Due to the string_view
  and move semantics, we actually save a copy in the process.
- Removing/rewriting some state-the-obvious comments.
- Using gMock matchers in tests.

Demo: https://screencast.googleplex.com/cast/NTc1NjE4MDI5NDAwODgzMnxlMmQ0OTQxZC1jZg

Bug: 320965828, 40100455
Change-Id: Ibc85dc0bd7b6920518789da722220b6b2430c68b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5938884
Reviewed-by: Dominic Battré <battre@chromium.org>
Commit-Queue: Florian Leimgruber <fleimgruber@google.com>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1371934}
4 files changed
tree: edd27a38fe51d8d3aeb88d6a49a09f8db510e175
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. google_update/
  24. gpu/
  25. headless/
  26. infra/
  27. ios/
  28. ipc/
  29. media/
  30. mojo/
  31. native_client_sdk/
  32. net/
  33. pdf/
  34. ppapi/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .git-blame-ignore-revs
  54. .gitallowed
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. CPPLINT.cfg
  69. CRYPTO_OWNERS
  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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