[NTP Customization] Hide the "Discover feed" option in the main bottom sheet when necessary

This CL adds the logics to hide the "Discover feed" option in the main
bottom sheet if the feed section is completely removed from the new tab
page. In other words, it is removed if the user is in one of the EEA
countries and the searching engine using is not the google one.

The change of the CL is shown in the following documentation:
https://docs.google.com/document/d/1bMRVyyqOd0-cAmyTbL9IhKNU9uSvDdpdCngSzSXIHnk/edit?tab=t.0#bookmark=id.yhcjjq3eiz9t

Bug: 376238770
Change-Id: I8a8d51788952339202334cc7c5764d2e6c423ff9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6397805
Reviewed-by: Jian Li <jianli@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Yanling Hu <yanlinghu@google.com>
Cr-Commit-Position: refs/heads/main@{#1442284}
6 files changed
tree: 3697a4a6d7480fed3b2ec480d34cb65600462f0d
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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