iwa: Add `IwaSource*WithMode::WithFileOp`, rework source inheritance

This CL does two things:
1. The new `IwaSource(Bundle)WithMode::WithFileOp` method closes the
   missing link between sources with mode and sources with mode and file
   op.
2. We previously inherited all bundle-based sources from
   `IwaSourceBundle`. This was nice for sharing code and allowing
   implicit conversions, but allowed you to write code like the
   following, which doesn't really make sense:
   ```
   IwaSourceBundleProdModeWithFileOp bundle;
   IwaSourceBundleDevModeWithFileOp new_bundle =
     bundle.WithDevModeFileOp(
       IwaSourceBundleDevFileOp::kReference
     );
   ```
   With the changes in this CL, you'd have to be more explicit if you
   _really_ wanted to achieve this:
   ```
   IwaSourceBundleProdModeWithFileOp bundle;
   IwaSourceBundleDevModeWithFileOp new_bundle(
     bundle.path(),
     IwaSourceBundleDevFileOp::kReference
   );
   ```

Bug: None
Change-Id: Ibb202bc34f4a56a396270618fca5ba72e53ed123
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5372845
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Auto-Submit: Christian Flach <cmfcmf@chromium.org>
Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1273492}
3 files changed
tree: 995bcb00af5b4ce9904d0f13b85d20c9d0371627
  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. codelabs/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. DEPS
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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