diagnostics: Simplify MoveAppToTestingScreen API to not return anything

The current boolean returned is not being used in frontend. The return
result doesn't seem be to valuable for any metrics. Simplify both
MoveAppToTestingScreen and MoveAppBackToPreviousScreen function. Remove
await in frontend since it doesn't affect the behavior.

This CL addresses the comment in previous CL.
https://chromium-review.googlesource.com/c/chromium/src/+/3979068/
comment/7d2b7fe3_b4ceb777/

gtest_filter=DiagnosticsAppWithInput_InputList.All,

Bug: b/253234353
Test: JS browser test --
Test: input_data_provider_unittest
Change-Id: I6b0ec68219210aa18b3ed0526ad005b6e3cfc176
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4003539
Reviewed-by: Chris Bookholt <bookholt@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Wenyu Zhang <zhangwenyu@google.com>
Reviewed-by: Ashley Prasad <ashleydp@google.com>
Cr-Commit-Position: refs/heads/main@{#1068675}
6 files changed
tree: 328a8f56a54f4e12764212c6a9ef4c498d7daf1a
  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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