binding: Removes Document::wrap that must be equivalent to Node::wrap.

Removes unnecessary Document::wrap and associateWithWrapper.
The special code in these functions were made in order to keep
WindowProxy::m_document updated and consistent with toV8(document).
But we no longer rely on the hack, and we can remove the dead code.


Cr-Commit-Position: refs/heads/master@{#435226}
4 files changed