[BatchUpload] Change the data/model key mapping

In preparation to using SyncService DataTypeLocalDataBatchUploader
interface, we simplify the mapping between the data and their models.
Now using the real data key, instead of expecting the interface to keep
record of the mapping of the displayed items.

This forces the BatchUploadDialogHandler itself to keep track of its
own id mapping per data type, given that Mojo can only support one id
type, in order to retrieve back the right data id.

This way the Id mapping complexity is decoupled from the data types.

Currently the allowed Ids are only strings since it is the expected id
type to be used first. But in theory, if any other id type is needed,
the `BatchUploadDataItemModel::DataId` should support multiple types
through `std::variant`, and it would be up to the data type to
ensure the right data id type.

Bug: b:372701325
Change-Id: I11b1f204c021f3d6c6c23a329b1fd424cd3cca78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5922707
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Ryan Sultanem <rsult@google.com>
Cr-Commit-Position: refs/heads/main@{#1367448}
14 files changed
tree: 8e99c2e83147081fd62b92b5204c83181d9f5ac5
  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. google_update/
  24. gpu/
  25. headless/
  26. infra/
  27. ios/
  28. ipc/
  29. media/
  30. mojo/
  31. native_client_sdk/
  32. net/
  33. pdf/
  34. ppapi/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .git-blame-ignore-revs
  54. .gitallowed
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. CPPLINT.cfg
  69. CRYPTO_OWNERS
  70. DEPS
  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
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