[M121][fetch-later] Flush all pending requests on page entering bfcache.

CP approved at https://crbug.com/1465781#c104

According to the privacy discussion [1], the API has to flush all
pending requests when page enters BFCache to avoid potential
privacy issues when network changes after BFCached.

[1]: http://b/310541607#comment28

(cherry picked from commit 57b298339a2e0a095b02ef0b627929ab8a98a3d3)

Bug: 1465781
Change-Id: Ieb721a2f20f1fc3376fe7ce5d1380a1b80472bbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5179871
Commit-Queue: Ming-Ying Chung <[email protected]>
Reviewed-by: Kenichi Ishibashi <[email protected]>
Auto-Submit: Ming-Ying Chung <[email protected]>
Reviewed-by: Nidhi Jaju <[email protected]>
Cr-Original-Commit-Position: refs/heads/main@{#1246271}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5196873
Owners-Override: Fergal Daly <[email protected]>
Cr-Commit-Position: refs/branch-heads/6167@{#1360}
Cr-Branched-From: 222e786949e76e342d325ea0d008b4b6273f3a89-refs/heads/main@{#1233107}
3 files changed
tree: 5ac1fd4e257210786fbb959dbc6dd341bd668c26
  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. .clang-format
  52. .clang-tidy
  53. .clangd
  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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