[Sync] Cleanup datatype configuration error handling.
The FailedDataTypeHandler is now informed immediately of failures, including
datatype errors, and is therefore authoritative source for all errors. As such,
partial success is no longer tracked and the various ModelTypeSets for error
types in configure results are removed.
BUG=368834
Review URL: https://codereview.chromium.org/
420633002
Cr-Commit-Position: refs/heads/master@{#288464}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288464 0039d316-1c4b-4281-b951-d872f2087c98