Fix the case when no previous screen is present in WizardController

In case the device is owned, the WizardController is not created at
login screen. It might get created later though, e.g. by triggering
the powerwash shortcut. In that case, it has no context of previous
screen (which was the login screen) and needs to apply some logic
if the current screen is canceled.

BUG=1369529
TEST=None

Change-Id: Iccbda51ac4b5d6b74d4c7b57d33ed3fd198a0895
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3925981
Reviewed-by: Roman Sorokin <rsorokin@google.com>
Commit-Queue: Igor <igorcov@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1053453}
1 file changed
tree: 8530d87671a968e709302a7cc2f34449f2397e3b
  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. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. DIR_METADATA
  68. ENG_REVIEW_OWNERS
  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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