GitLab

- Remove getNumberOfSyncedDevices which was unused.
- Merge init() into the constructor.
- Add a few comments/TODOs where the Java PSS still diverges from the
  native version.
- Add warning comments to some potentially dangerous methods (notably
  getChosenDataTypes and getPreferredDataTypes).
- Mark getPreferredDataTypes as deprecated. Its only usage was an error
  (see crbug.com/1157046).

Bug: 1135552
Change-Id: I8d0d1e8165086ef6af498a2010a887ba25ae7efd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2582083Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836034}