Revert "[Extensions] Fix Style Origin for extension-injected stylesheets"

This reverts commit e2c4d3aa6deb39e337e4c17d460447e639f99a88.

Reason for revert: Speculative revert as this might be causing consistent
ExtensionsMenuViewBrowserTest.PinningDisabledInIncognito test failures.
Sample first failed run:
https://ci.chromium.org/p/chromium/builders/ci/Mac10.11%20Tests/60440

Will reland if the revert does not fix the bot.

Original change's description:
> [Extensions] Fix Style Origin for extension-injected stylesheets
>
> https://crrev.com/7776b460 inadvertently changed the style origin for
> extension-injected stylesheets to be "user" rather than "author". This
> meant that they would no longer override stylesheets specified by the
> webpage if they had more specific rules.
>
> Fix this by setting the style origin back to "author" (as it was
> previously), and adding a regression test.
>
> Bug: 1175506
> Change-Id: Ic799eba52dc0981899b78bade6f4cb46c6ed610e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2683052
> Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
> Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#852434}

TBR=rdevlin.cronin@chromium.org,karandeepb@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: Ie6bdb4146e309d20230637100c666f8e54f0fad2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1175506
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2687095
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#852548}
6 files changed
tree: db3ab3ab0aa9dd264aa4402c28d6a65cf7d5b654
  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. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  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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