Fix leak in SelectFileDialogLinuxPortal

Both SelectFileDialogLinuxPortal and DialogInfo were getting leaked.
This is due to a reference cycle caused by
SelectFileDialogLinuxPortal keeping a scoped_refptr to the DialogInfo,
while the DialogInfo keeps 2 callbacks that bind to
SelectFileDialogLinuxPortal methods.  This CL breaks the reference
cycle by switching the callbacks to use weak pointers.  However,
DialogInfo is still leaked with this change because dbus::Bus also
has callbacks that bind do DialogInfo, so these are changed to weak
pointers as well.

R=sky

Bug: None
Change-Id: I4ee11c67f2181b2ec8cdbefdf2536e89116a42c4
Low-Coverage-Reason: Currently no tests for SelectFileDialogLinuxPortal
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4819611
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1190471}
2 files changed
tree: 599574fe7fbb5cce5e7654d48f9afbbc4685b7a6
  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. webkit/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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