Revert "Deflake model validation browser test"

This reverts commit 796a33326e92a9da9b867bffc5ec117700037afe.

Reason for revert:
It seems that 
ModelExecutionValidationBrowserTest.ModelExecutionFailsServerFailure and 
ModelExecutionValidationBrowserTest.ModelExecutionSuccess are failing after this CL.
https://ci.chromium.org/ui/p/chromium/builders/ci/Mac13%20Tests/9157/overview

Original change's description:
> Deflake model validation browser test
>
> Add wait based on runloop before waiting for the UMA
>
> Change-Id: I6fffc2469834923e7b2dc3b9d8548d7b73f91dc3
> Bug: b/41493340
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5294954
> Commit-Queue: Raj T <rajendrant@chromium.org>
> Reviewed-by: Sophie Chang <sophiechang@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1260618}

Bug: b/41493340
Change-Id: Ie90d477bbab680d4445b745fa1bc7d353c2b458d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5297355
Owners-Override: Robert Lin <robertlin@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Huanpo Lin <robertlin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1260819}
1 file changed
tree: ddc7453344ff38aac3c3887a2606d848975d5815
  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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