Rename and Move RFHI::InsidePortal() to FrameTree::IsPortal()

Current naming of RenderFrameHostImpl::InsidePortal() is confusing
considering various cases like fenced frame embedded inside a portal.
Also InsidePortal() API checks for IsPortal() value.

To avoid this confusion, we want to rename it back to IsPortal and
looking at the usecases of InsidePortal, it would be more apt to have
it inside FrameTree to avoid FTN -> RFH usages.

We also double check that a fenced frame when embedded inside a portal
FrameTree::IsPortal() returns false.

BUG=1294795,1179502

Change-Id: I628659265cd1c5acba31386cc0ebe2d9b89b8157
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3424548
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Sreeja Kamishetty <sreejakshetty@chromium.org>
Cr-Commit-Position: refs/heads/main@{#968287}
8 files changed
tree: 716ba7dfa81f4d4ecf57364be899ba4e3c891dbd
  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. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  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. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  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
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