Return the empty string for UA-Platform-Version hint on Linux

Per https://github.com/WICG/ua-client-hints/commit/56df868c6c3564461b4c0a42ea603b80fa94c8d2

Prior to this commit, UA-Platform-Version HTTP header and User-Agent
high entropy hints revealed Linux kernel version number. This
information has no legitimate use on the web and is useful only for
fingerprinting. This commit replaces real Linux version with an empty
string, matching the current specification.

Original patch proposed in
https://chromium-review.googlesource.com/c/chromium/src/+/4005183

Bug: 40245146
Change-Id: I2781aea3eac37ae71a9f3c8e85985d9ad25a45da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6061517
Commit-Queue: Anton Bershanskyi <bershanskyi@gmail.com>
Reviewed-by: Mike Taylor <miketaylr@chromium.org>
Reviewed-by: Victor Tan <victortan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1452234}
8 files changed
tree: 26d6ce5bdad7ce8b45043d928295c5b17bac8c13
  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. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  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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