[M137] Fix for crash in FullscreenHtmlApiHandlerBase when no active tab

Original change's description:
> Fix for crash in FullscreenHtmlApiHandlerBase when no active tab
> 
> When no active tab is set in the FullscreenHtmlApiHandlerBase the Null
> Pointer Exception is thrown when onMultiWindowModeChanged is called. The
> issue is present when the window is exiting the fullscreen mode and no
> active tab is set.
> 
> Null pointer validation was added to the MultiWindowModeObserver
> implementation.
> 
> Bug: 414919914
> Bug: 410789979
> Change-Id: I65fa4349b548a98c87ece70355d1088a88adfb83
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6508871
> Reviewed-by: Sirisha Kavuluru <skavuluru@google.com>
> Reviewed-by: Peter Conn <peconn@chromium.org>
> Commit-Queue: Wojciech Zwonarz <wzwonarz@google.com>
> Cr-Commit-Position: refs/heads/main@{#1456149}

Bug: 416179315,414919914,410789979
Change-Id: I65fa4349b548a98c87ece70355d1088a88adfb83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6533234
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Chrome Cherry Picker <chrome-cherry-picker@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/7151@{#840}
Cr-Branched-From: 8e0d32ed6e49a2415b16e5ed402957cac2349ce2-refs/heads/main@{#1453031}
2 files changed
tree: 097a6355412e02d740de919790890ea807b0f10a
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  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. CPPLINT.cfg
  68. CRYPTO_OWNERS
  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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