Improve resolving callback_type.
Add libraries for Deferred.
Use Deferred.
Use JsDeferred.
Merge branch 'improve_resolve_callback_type'
Merge branch 'use_deferred'
Fix Japanese message.
Merge branch 'fix_message'
Use correct argument name.
Merge branch 'use_deferred'
Merge branch 'use_deferred' into improve_message
Fix argument name.
Merge branch 'use_deferred'
Merge branch 'use_deferred' into improve_message
Show warning in badge.
Merge branch 'improve_message'