Ash: Decouple Video Conference Manager from Crosapi

This commit refactors VideoConferenceManagerAsh to completely decouple
it from the Crosapi framework.

Ownership of VideoConferenceManagerAsh is moved to
ChromeBrowserMainExtraPartsAsh. This guarantees the manager's lifecycle
exceeds all of its clients, ensuring a memory-safe shutdown. A global
singleton accessor (VideoConferenceManagerAsh::Get()) is introduced,
providing a clean and direct access pattern for all VCM clients.

Key changes:
- All Crosapi/Lacros-specific code and mojo interfaces are removed.
- All clients and browser tests are updated to use the new singleton
  accessor.
- Client classes now use raw_ref for the manager, improving safety.
- The VCM browser test is moved from crosapi/ to video_conference/.
- BUILD.gn and DEPS files are updated to reflect new dependencies.

This improves modularity, removes obsolete code, and establishes a
clean, memory-safe ownership structure.

Bypass-Check-License: file moved
Bug: 354710097
Test: Tryjob
Change-Id: Ia4e830bdee2d687e87344c49c8ba21719e6e0269
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6874242
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Di Wu <diwux@google.com>
Cr-Commit-Position: refs/heads/main@{#1510773}
35 files changed
tree: 38692def56df0ef550d7f29cf7a8f719f061c1bf
  1. .gemini/
  2. .github/
  3. agents/
  4. android_webview/
  5. apps/
  6. ash/
  7. base/
  8. build/
  9. build_overrides/
  10. buildtools/
  11. cc/
  12. chrome/
  13. chromecast/
  14. chromeos/
  15. codelabs/
  16. components/
  17. content/
  18. crypto/
  19. dbus/
  20. device/
  21. docs/
  22. extensions/
  23. fuchsia_web/
  24. gin/
  25. google_apis/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. net/
  34. pdf/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .cursorignore
  54. .geminiignore
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  71. CRYPTO_OWNERS
  72. DEPS
  73. DIR_METADATA
  74. LICENSE
  75. LICENSE.chromium_os
  76. OWNERS
  77. PRESUBMIT.py
  78. PRESUBMIT_test.py
  79. PRESUBMIT_test_mocks.py
  80. README.md
  81. SECURITY_OWNERS
  82. WATCHLISTS
README.md

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For historical reasons, there are some small top level directories. Now the guidance is that new top level directories are for product (e.g. Chrome, Android WebView, Ash). Even if these products have multiple executables, the code should be in subdirectories of the product.

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