[Merge M108] Fix crash when appending data to a null parser

I haven't figured out exactly the flow that makes this happen, but my
best guess is that it's similar to what the comment right above the
condition here describes.

(cherry picked from commit c931ab4da1fc676eeb34a112bf00540e3b68c518)

Bug: 1377040
Change-Id: I27260b6d982093c2f43ee7f52662c9a056a813bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3969118
Commit-Queue: Nate Chapin <japhet@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1061820}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3971892
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/branch-heads/5359@{#194}
Cr-Branched-From: 27d3765d341b09369006d030f83f582a29eb57ae-refs/heads/main@{#1058933}
1 file changed
tree: 7df1f839ca663d029dd52c9125713ace720a2058
  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. 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. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. DIR_METADATA
  68. ENG_REVIEW_OWNERS
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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