Revert "core: set PROVIDER type as Persistent class id"

Revert "core: set PROVIDER type as Persistent class id"

This reverts commit 3c44100558b4e9e48e0e711e38acc91e0f870a9f.

Reverted for breaking node-heapdump[0].

AsyncWrap assigns a class id but does not set a v8::RetainedObjectInfo
provider callback with v8::HeapProfiler::SetWrapperClassInfoProvider().
The result is a null pointer dereference when taking a heap snapshot.

It can probably be solved by setting a generic provider callback inside
the AsyncWrap constructor but that may have performance ramifications
that need to be investigated first.  I move to revert it for now.

[0] https://github.com/bnoordhuis/node-heapdump

PR-URL: https://github.com/nodejs/io.js/pull/1827
Reviewed-By: Trevor Norris <trev.norris@gmail.com>