Revert "Merge ContextLifecycleNotifier into MojoBindingContext."

This reverts commit 03ad8ab3ca36d5574cf107251d0f47a867288975.

Reason for revert: After some more discussion and thought, we have reached the conclusion that many users of ContextLifecycleNotifier/Observer don't care about the Mojo capabilities introduced by MojoBindingContext. As such, this CL reverts the merging of the 2 classes, with future CLs making MojoBindingContext extend ContextLifecycleNotifier.

Original change's description:
> Merge ContextLifecycleNotifier into MojoBindingContext.
>
> Following the discussions on platform-architecture-dev[1], this CL
> expands MojoBindingContext's responsibility to include context lifecycle
> notifications which were previously in ContextLifecycleNotifier.
>
> [1] https://groups.google.com/a/chromium.org/g/platform-architecture-dev/c/_7Ybv_RLgic
>
> Change-Id: Icdcc2a59bf0580b919d1dbb015a45bfd184583b3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596279
> Commit-Queue: Tal Pressman <talp@google.com>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#844692}

TBR=haraken@chromium.org,kouhei@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,talp@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I5c2e3e7f08d20a4a4a40bd3d5f9bc863507a26b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2654765
Reviewed-by: Tal Pressman <talp@google.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Tal Pressman <talp@google.com>
Cr-Commit-Position: refs/heads/master@{#848005}
33 files changed
tree: 910fa7f858b13f89392764d3a6a434224abeadf1
  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
README.md

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