Replace instead of merging global network configuration

When an ONC GlobalNetworkConfiguration is applied, replace the previous
GlobalNetworkConfiguration instead of merging it.

MergeDictionary was used here since the code was introduced in
https://codereview.chromium.org/23526016 but I'm suspecting it was an
oversight.

Effectively it allows adding/modifying GlobalNetworkConfiguration
entries without a chrome restart, but it does not allow removing entries
without a chrome restart.
See https://chromium.googlesource.com/chromium/src/+/master/components/onc/docs/onc_spec.md#GlobalNetworkConfiguration-type
for possible entries.

If we want such a behavior, we should implement it per setting and not
generally on the input dictionary level IMO.

There was one unittest which relied on the behavior by setting two
policies in a row, changed it.

Bug: b:219568573
Change-Id: I7c3b59b3a8af2d39438e05fa69c9dc2e82af82ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3449263
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Michael Ershov <miersh@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/main@{#996390}
6 files changed
tree: 83eb8234c2d68e771276fd0724eff8fb43099d2a
  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. 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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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