Remove unneeded type indirections from CallbackPromiseAdapter.

Now that Blink uses std::unique_ptr instead of OwnPtr, type mapping
structs and using-declarations in CallbackPromiseAdapter are no-ops and
can thus be removed.

Review-Url: https://codereview.chromium.org/2131873002
Cr-Commit-Position: refs/heads/master@{#404346}
1 file changed