Revert "[MagicStack] Add flag for enabling magic stack"

This reverts commit 335e462ff4263d501a133fa84eff8ea3ce30d502.

Reason for revert: caused
testTapMVTilesInSingleSurfaceWithSurfacePolish__Instant_Return to
fail on android-oreo-x86-rel.

Original change's description:
> [MagicStack] Add flag for enabling magic stack
>
> Added a flag "MagicStack" to control whether to enable the magic stack module on Start Surface and NTP instead of using the parameter "use
> magic space" of feature flag "Surface polish".
>
> Bug: 1512962
> Change-Id: Ib5b75f83b6dac4aa91d60d40f25cb8aae3b77beb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5142506
> Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
> Commit-Queue: Xinyi Ji <xinyiji@chromium.org>
> Reviewed-by: Xi Han <hanxi@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1240246}

Bug: 1512962, 1514456
Change-Id: I945fad6d2978bafe1a3ee595f92c177663309c53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5149636
Auto-Submit: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1241175}
12 files changed
tree: 54ccecffd703cc212e47b9bafb43409b56f0986e
  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. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  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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