Remove WaitForInterstitial method in tests

This method is no longer required with committed interstitials (it now
only asserts an interstitial is shown, then runs
WaitForRenderFrameReady), since the regular navigation wait works for
committed interstitials. It seems the WaitForRenderFrameReady was also
causing flaky tests due to timeouts (e.g. crbug.com/1287661) if it
happened to be called after the RenderFrameReady event happened.
This replaces the method with an assertion that an interstitial is
shown in all callsites (except where an assertion would be redundant
due to an existing similar assertion).

Bug: 1287661
Change-Id: Ie54c5b63634215c1f7bfb07c92bfdfb51e9913ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3596203
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Roman Sorokin <rsorokin@chromium.org>
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Commit-Queue: Carlos IL <carlosil@chromium.org>
Auto-Submit: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/main@{#995272}
8 files changed
tree: 0016d63da5db9b4ca117702d220e23574abd6100
  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/
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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