Revert "Log NavigationPredictor metrics when links enter the viewport."

This reverts commit 60e8ab3f3be7eef75f5b43ba8d01a2136ff0f85b.

Reason for revert: Flaky tests failing since https://ci.chromium.org/ui/p/chromium/builders/ci/linux-chromeos-rel/47204/overview

Original change's description:
> Log NavigationPredictor metrics when links enter the viewport.
>
> NavigationPredictorAnchorElementMetrics will now be logged only for
> links that enter the viewport. Links that are inserted after onload
> will also be reported.Only a fraction (1% by default) of links entering
> the viewport are reported.
>
> Aggregate statistic on all links on the page
> (NavigationPredictorPageLinkMetrics) will now be reported for all
> links on the page (regardless of whether then enter the viewport),
> including links inserted after onload.
>
> Also remove obsolete Prefetching code in NavigationPredictor.
> Now that we have Speculation Rules, prefetching code should be distinct
> from link click prediction. Also we already have prefetching logic for
> the prefetch proxy in chrome/browser/prefetch/prefetch_proxy. Despite
> the name, most of that code is not proxy specific. If we want to
> reintroduce non-proxied prefetching, that code can likely be
> generalized.
>
> Bug: 1157161, 1199367
> Change-Id: Ie6f718bec09fc1e69415dce620a1164b07b20381
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2724978
> Commit-Queue: Simon Pelchat <spelchat@chromium.org>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: Tarun Bansal <tbansal@chromium.org>
> Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
> Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#875463}

Bug: 1201988
Change-Id: Id8f14ef0787bd9d3ff4103bfadeb7f97bd8b8d0f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2847831
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: My Nguyen <myy@chromium.org>
Owners-Override: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#875534}
GitOrigin-RevId: 5f6d832d93761095e55f495b766cc6d130810dfe
3 files changed
tree: c68ad8e96061f0d91b8eb46d442aded14b64b8bd
  1. .style.yapf
  2. DEPS
  3. DIR_METADATA
  4. OWNERS
  5. accessibility/
  6. android/
  7. apply_cpplint_header_guard.py
  8. auto-nav.py
  9. autotest.py
  10. bash-completion
  11. binary_size/
  12. bisect-builds.py
  13. bisect_repackage/
  14. bisect_test.py
  15. boilerplate.py
  16. buildstate.bat
  17. buildstate.py
  18. cfi/
  19. check_ecs_deps/
  20. check_git_config.py
  21. check_grd_for_unused_strings.py
  22. checkbins/
  23. checklicenses/
  24. checkperms/
  25. checkteamtags/
  26. chrome_extensions/
  27. clang-format-js
  28. clang/
  29. code_coverage/
  30. compile_test/
  31. coverity/
  32. cr/
  33. cros/
  34. cygprofile/
  35. determinism/
  36. diagnose-me.py
  37. diagnosis/
  38. download_optimization_profile.py
  39. dromaeo_benchmark_runner/
  40. dump_process_memory/
  41. emacs/
  42. find_runtime_symbols/
  43. flags/
  44. flakiness/
  45. fuchsia/
  46. gdb/
  47. generate_library_loader/
  48. generate_shim_headers/
  49. generate_stubs/
  50. get_swarming_logs/
  51. git/
  52. gn/
  53. grit/
  54. gritsettings/
  55. gypv8sh.py
  56. idl_parser/
  57. imagediff/
  58. include_tracer.py
  59. infra/
  60. ipc_fuzzer/
  61. ipc_messages_log.py
  62. json_comment_eater/
  63. json_schema_compiler/
  64. json_to_struct/
  65. l10n/
  66. licenses.py
  67. linux/
  68. lldb/
  69. luci-go/
  70. mac/
  71. make-gtest-filter.py
  72. mb/
  73. md_browser/
  74. media_engagement_preload/
  75. memory/
  76. memory_inspector/
  77. metrics/
  78. msan/
  79. multi_process_rss.py
  80. nocompile_driver.py
  81. omahaproxy.py
  82. oopif/
  83. origin_trials/
  84. page_cycler/
  85. perf/
  86. perry.py
  87. polymer/
  88. privacy_budget/
  89. protoc_wrapper/
  90. python/
  91. real_world_impact/
  92. remove_duplicate_includes.py
  93. remove_stale_pyc_files.py
  94. resources/
  95. resultdb/
  96. roll_webgl_conformance.py
  97. run-swarmed.py
  98. security/
  99. site_compare/
  100. sort-headers.py
  101. sort_sources.py
  102. stats_viewer/
  103. strict_enum_value_checker/
  104. style_variable_generator/
  105. sublime/
  106. symsrc/
  107. tcmalloc/
  108. tests/
  109. traceline/
  110. traffic_annotation/
  111. translation/
  112. typescript/
  113. uberblame.py
  114. ubsan/
  115. unused-symbols-report.py
  116. update_pgo_profiles.py
  117. usb_gadget/
  118. v8_context_snapshot/
  119. valgrind/
  120. variations/
  121. vim/
  122. vscode/
  123. web_bluetooth/
  124. web_dev_style/
  125. win/
  126. yes_no.py