RPP: Fix overwriting of default config; simplifying config.

Discovered this investigating the failures of my JS Samples CL/revert: https://ci.chromium.org/ui/p/devtools-frontend/builders/ci/Stand-alone%20Win/12265/overview I inadvertently mutated the default config in a test. Unfortunate it was so easy to do that and not trigger alarms. This CL has safeguards.

We overhaul the configuration so its a flat object that Readonly<> will help enforce. Meanwhile, we can also simplify config consumption quite a bit.

Bug: 1477187
Change-Id: I783edfa3acfdc8c22143140cc967b57294a6eea7
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5528502
Commit-Queue: Paul Irish <paulirish@chromium.org>
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
Auto-Submit: Paul Irish <paulirish@chromium.org>
11 files changed
tree: 685e20531b55355982ff9eacfc8f43800628d160
  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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