Reland "Migrate auxiliary search module as ephemeral"

This is a reland of commit b4c583da01804e956790dcec5296736feb732e03

Referencing the feature param name causes static initializer.
Use a string literal instead in about_flags.cc.

Original change's description:
> Migrate auxiliary search module as ephemeral
>
> Reuses the existing feature flag for enabling the module and for
> force setting the module.
> Enables ephemeral backend by default to make the rollout of the tips
> and this card independent.
> Adds additional VLOGs to make debugging easier.
>
> Bug: 382803396
> Change-Id: I1cdc23ccaca6db2f67c78442b223d714de5197e7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6175554
> Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
> Commit-Queue: Siddhartha S <ssid@chromium.org>
> Reviewed-by: Xinyi Ji <xinyiji@chromium.org>
> Reviewed-by: Xi Han <hanxi@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1408181}

Bug: 382803396
Change-Id: I321a4f14df2a24d0234d235e06dd4069ec0586f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6180921
Reviewed-by: Xinyi Ji <xinyiji@chromium.org>
Commit-Queue: Siddhartha S <ssid@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1409210}
21 files changed
tree: ab80a9e99332899ad4b739b6531e3a4c6e7a6d5e
  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. description
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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