arc: Fix UpdateEnabledStateByUserTypeUMA crash

http://crrev.com/c/4629590 changes UpdateEnabledStateByUserTypeUMA
to use GetBrowserContextByUser but neglected the case that there
could be no user when UpdateEnabledStateByUserTypeUMA is called.
GetBrowserContextByUser crashes when there is no user. This CL
fixes the crash by null check primary user before calling into
GetBrowserContextByUser.

Bug: b:288964303
Change-Id: I3eb1e5d219abd4368f976c63a5df599793125e50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4651688
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Auto-Submit: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1163033}
1 file changed
tree: 3d285f20970d3d4093261b152524ddb54ee5d9e7
  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. 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. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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