Make form submissions cancel pending jsurl navigations

After http://crrev.com/c/1922699 iframes which are assigned a javascript
url via the iframe.src property and then immediately targeted by a form
submission would load both the javascript url and then the form
submission. Before, only the form submission would occur.

This patch fixes the regression by cancelling the pending javascript url
navigation when a form submission is scheduled.

Bug: 1084874
Change-Id: I93623d2fc5f5a1bd207a9f0956004be920b2e270
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2211099
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#772875}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225259
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/branch-heads/4103@{#655}
Cr-Branched-From: 8ad47e8d21f6866e4a37f47d83a860d41debf514-refs/heads/master@{#756066}
3 files changed
tree: 5a235746cfb61e81605666160a5d959b239a97e2
  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. cloud_print/
  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. jingle/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .vpython
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. ENG_REVIEW_OWNERS
  68. LICENSE
  69. LICENSE.chromium_os
  70. OWNERS
  71. PRESUBMIT.py
  72. PRESUBMIT_test.py
  73. PRESUBMIT_test_mocks.py
  74. README.md
  75. WATCHLISTS
README.md

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