Nobody uses base::JsonPrefStore::ReadResult without a path
and if they had tried it, it would have crashed.

This removes the code that tried to support non-path
JsonPrefStore and adds a DCHECK in the constructor in case
it happens in the future.

If the code is ever needed in the future, the
scoped_ptr<ReadResult> need to be initialized
with new ReadResult.

BUG=
R=bauerb@chromium.org

Review URL: https://codereview.chromium.org/836093005

Cr-Commit-Position: refs/heads/master@{#310300}
1 file changed