[M131] Style prefetch network request failures differently

The default styling made it seemed like a prefetch failure affects
content displayed by the current page (which isn't the case). Updated
to change the color to yellow (to mirror warnings in the console) and
use a warning icon.

Change-Id: Ib1ac103694b4a21f7b52e1825ea51b0796663a1a
Bug: 372055494
Before: https://imgur.com/a/JnpyrlE
After: https://imgur.com/a/gGF8Win
Demo: https://adithyas-serve.glitch.me/start-failed-prefetch.html (have network panel open when navigating to this URL)
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5908212
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>
Reviewed-by: Wolfgang Beyer <wolfi@chromium.org>
(cherry picked from commit 160e49211ebcd5b1602b377d2fca62470666d781)
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5939826
Reviewed-by: Connor Clark <cjamcl@chromium.org>
5 files changed
tree: 9e71e5ce14e98bd248d2929ae75dcd5522df1d39
  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. .gitallowed
  20. .gitattributes
  21. .gitignore
  22. .gitmodules
  23. .gn
  24. .mailmap
  25. .npmignore
  26. .npmrc
  27. .style.yapf
  28. .stylelintignore
  29. .stylelintrc.json
  30. AUTHORS
  31. BUILD.gn
  32. codereview.settings
  33. CONTRIBUTING.md
  34. DEPS
  35. favicon.ico
  36. LICENSE
  37. OWNERS
  38. package-lock.json
  39. package.json
  40. PRESUBMIT.py
  41. README.md
  42. tsconfig.json
  43. WATCHLISTS
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