Reland "[Profiles] Delete ephemeral profile after removing last keep alive"

This is a reland of commit 400a9e4d5abce06a7049355f887cf28d5d603a30

Flaky tests on Mac were caused due to a HistoryMenuBridge keep alive
that was not being released.
A fix was submited on https://crrev.com/c/4406577.

Using ProfileDeletionObserver instead of MultipleProfileDeletionObserver
in ProfileManagerBrowserTest.EphemeralProfile test, which waits for
OnProfileWasRemoved() instead of OnProfileWillBeRemoved().

Original change's description:
> [Profiles] Delete ephemeral profile after removing last keep alive
>
> This CL refactors the deletion of ephemeral profile by scheduling the
> ephemeral profile for deletion when removing its last keep alive.
>
> The calls to ScheduleEphemeralProfileForDeletion() are removed from
> OnBrowserClosed() and when closing the sign-in page and the sync
> confirmation page in the profile picker. It is then only called from
> RemoveKeepAlive().
>
> A kProfileDeletionProcess keep alive is create and is taken before
> removing the last keep alive and to keep the profile alive until the
> deletion process is completed. It will also be useful for refactoring
> the deletion of regular profiles, to avoid them from being randomly
> unloaded.
>
> Bug: 1395367
> Change-Id: Ia4d8b281a36e6ae4caf99abd55b9ccbda8f68075
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4345753
> Reviewed-by: David Roger <droger@chromium.org>
> Commit-Queue: Gabriel Oliveira <gabolvr@google.com>
> Reviewed-by: Alex Ilin <alexilin@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1122988}

Bug: 1395367
Change-Id: I70a1970401501a2b20f82a11942c7704466911a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4395932
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Commit-Queue: Gabriel Oliveira <gabolvr@google.com>
Cr-Commit-Position: refs/heads/main@{#1129323}
12 files changed
tree: d06031d316f9e85961040571634ee4ba60627f4c
  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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