[StartSurface] Fix new tab button color on the start surface in incognito mode

Note that isGridTabSwitcherEnabled is already return true when the
start surface is enabled but not isStartSurfaceStackTabSwitcherEnabled

This CL adds missed changes in
https://chromium-review.googlesource.com/c/chromium/src/+/2173118

Screenshots:
https://drive.google.com/file/d/1WaqU4-N9jYOVC62eMvgOnGlQAwLzJphI/view?usp=sharing
https://drive.google.com/file/d/1uVFGZYEIguGQNlNOWjTSJCHOx5CdBFuK/view?usp=sharing

Bug: 1076449
Change-Id: Ib70134dee8d3e12f204716394c4263bb976dfbb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209391
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Auto-Submit: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772431}
1 file changed
tree: a6bf202505715badfd58ebdc537eb8d79288cf66
  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. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. jingle/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .vpython
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. ENG_REVIEW_OWNERS
  68. LICENSE
  69. LICENSE.chromium_os
  70. OWNERS
  71. PRESUBMIT.py
  72. PRESUBMIT_test.py
  73. PRESUBMIT_test_mocks.py
  74. README.md
  75. WATCHLISTS
README.md

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