[DOMMessageQueue] Convert content_browsertests to preferred constructor

This CL converts the remaining usages of the DOMMessageQueue default
constructor in content_browsertests to the one that takes in a
WebContents instance. The former listens for messages from all
WebContents instances via a notification, while the latter observes the
passed-in WebContents instance to listen for messages from that
instance. We are trying to eliminate the former entirely as part of the
elimination of NotificationService.

The conversions are for the most part straightforward; the one
exception is site_per_process_unload_browsertest.cc, in which we need
to catch a WebContents instance created via a popup to be able to listen
for messages that occur in that instance.

Bug: 1174774
Change-Id: Ieaf7d2811282e2a3c0c7dbbe95c58d2c7aeff20c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3635781
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1001976}
12 files changed
tree: 1bdfb8662e1d5ae3ccbee9d5dc67671224b91b37
  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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