Turn iterator _!=_.end() DCHECK() into CHECK() for components/infobars

Accessing an invalid iterator can sometimes be a security
issue and these checks are cheap, so upgrade to CHECKs.
Generally these DCHECKS precede a use or erase of the
checked iterator, which if the check is invalid (ie. the
iterator == .end()) is UB.

For this CL instances were located with a weggli query:

```
weggli --verbose=1 --cpp \
         'DCHECK(_ != _.end());' \
      -p 'DCHECK(_.end() != _);' \
      -p 'DCHECK_NE(_, _.end());' \
      -p 'DCHECK_NE(_.end(), _);'
```

which should avoid any potentially expensive calculations
of the thing to be matched against .end().

This CL was uploaded by git cl split.

R=pkasting@chromium.org

Bug: 351745839
Change-Id: I3d1476d0999e6073775dcc60ed4d2efbc61a1a45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5704264
Commit-Queue: Alex Gough <ajgo@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1327713}
2 files changed
tree: 91fd2e26eeb44437046d86c42010901dd75ed6f6
  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. CPPLINT.cfg
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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