Revert StatisticsRecorder back to use a base::Lock.

This reverts the CL to use an absl R/W lock:
https://chromium-review.googlesource.com/c/chromium/src/+/3216667

As well as the follow up change on top of that:
https://chromium-review.googlesource.com/c/chromium/src/+/3378925

Reason for revert: We're seeing 10+ second hangs on iOS, unclear why,
appears to be starvation issues, despite that being unexpected. Needs
more investigation, reverting to fix the hangs to merge to iOS stable.

This CL bundles the changes together to revert.

Bug: 1284513, 1123627
Change-Id: I65405a7b444d31a6187884b5095fae20f3b1291b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3459839
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/main@{#970942}
4 files changed
tree: 966de6d3cfc817876530bc1085d0a088f8639ca6
  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. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  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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