RPP: Remove ThreadTracksSource.BOTH_ENGINEs and update screenshots

This is the first in a long set of CLs that will begin to remove old
engine functionality we do not need.

I have started with the ThreadTracksSource enum and removed the
BOTH_ENGINES flag; updating all the screenshot tests to use the new
engine exclusively. In future CLs I will remove the enum and the flag
entirely, but first I will go through and remove code that only runs for
the OLD_ENGINE flag.

Bug: 1499182
Change-Id: I7ab164e500576d044f334705d5e99649b3523e94
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5002389
Reviewed-by: Andres Olivares <[email protected]>
Auto-Submit: Jack Franklin <[email protected]>
Commit-Queue: Andres Olivares <[email protected]>
34 files changed
tree: fb8cb75971629f0236dd4de462b1945c6110a531
  1. .vscode/
  2. build_overrides/
  3. config/
  4. docs/
  5. extension-api/
  6. extensions/
  7. front_end/
  8. inspector_overlay/
  9. node_modules/
  10. scripts/
  11. test/
  12. third_party/
  13. v8/
  14. .clang-format
  15. .editorconfig
  16. .eslintignore
  17. .eslintrc.js
  18. .git-blame-ignore-revs
  19. .gitattributes
  20. .gitignore
  21. .gitmodules
  22. .gn
  23. .mailmap
  24. .npmignore
  25. .npmrc
  26. .style.yapf
  27. .stylelintignore
  28. .stylelintrc.json
  29. AUTHORS
  30. BUILD.gn
  31. codereview.settings
  32. DEPS
  33. LICENSE
  34. OWNERS
  35. package-lock.json
  36. package.json
  37. PRESUBMIT.py
  38. README.md
  39. tsconfig.json
  40. WATCHLISTS
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