[filesapp] Make Cancel the default button of the delete confirm dialog

Delete is the default button of the delete confirm dialog. Change that
to the Cancel button to resolve issue 1104191. Add / update tests:

 test.toolbarDeleteButtonOpensDeleteConfirmDialog (new test)

  • use to toolbar Delete button to open the delete confirm dialog
  • verify the dialog Cancel button is focused by default

 testcase.toolbarDeleteButtonKeepFocus (update test)

  • use to toolbar Delete button to open the delete confirm dialog
  • click the dialog Cancel button to close the dialog
  • verify the focus returns to toolbar Delete button: replace the
    existing verification code with a robust CSS :focus selector
  • update comments

Test: browser_tests --gtest_filter="*FilesAppBrowserTests*"
Bug: 1104191
Change-Id: I2465f75b85edd64d9df669d4410b3f82e3edeebc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2690621
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#853416}
3 files changed
tree: 08eb0c5bd7dcd0a078bcafe5ae583dd9fbf77e5c
  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. cloud_print/
  13. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  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
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