Revert "Implement keyboard shortcut for Lens Region Search."

This reverts commit 422b5c30cb847e3764ad8e6134c31d392ded7125.

Reason for revert: Causing most official builds to fail.

Original change's description:
> Implement keyboard shortcut for Lens Region Search.
>
> Keyboard shortcut (Ctrl/Cmd + Shift + L) is temporary as the keyboard
> shortcut has not yet been finalized. All code is flag-guarded so
> keyboard behavior is unaffected when flag is disabled.
>
> Tested on Linux, Mac, and Windows; with flag disabled and enabled; and
> with search engine set to Google, Bing (third-party search engine that
> supports region search), and Yahoo (does not support region search).
> Availability of keyboard shortcut is identical to that of region search
> when flag is enabled.
>
> Screenshot of context menu item with keyboard shortcut label:
> https://screenshot.googleplex.com/3MSyZ2kn9iGHDef
>
> Bug: 1392456
> Change-Id: Ifa4fb6297879d9ae4de3c0d9dc970c4878e52c04
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4043546
> Reviewed-by: Juan Mojica <juanmojica@google.com>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Commit-Queue: Bryan Nguyen <nguyenbryan@google.com>
> Cr-Commit-Position: refs/heads/main@{#1076590}

Bug: 1392456, 1394312
Change-Id: Ic6855d1e2afb6a7d8e98a18cc3ed53a7dbb3c083
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4063626
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Giovanni Ortuno Urquidi <ortuno@chromium.org>
Commit-Queue: Giovanni Ortuno Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1076673}
14 files changed
tree: 1d43934770be04e2dfd8436a4c806ec078510ebf
  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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