This de-couples NativeModule from the module system and completes the
main objective of this refactoring.

Agent: Each time an http req is sent to a socket, _cycle to try to dispatch
another. Problem became apparent in 4612b0 when we wait for connecting
sockets.

Agent queue waits for connecting sockets.

was breaking mac

Cannot just close the connection or client will error.

We hit an assertion failure when we tried to record the AST ID of
the (shared) .arguments variable proxy more than once.  This was hit
when we had multiple calls to the same parameter in a function that
used the arguments object.  The fix is to not visit the subexpressions
of the (shared) property access expression.

BUG=1060

Review URL: http://codereview.chromium.org/6368007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@6404 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Fixes non-raw REPL/Debugger on Posix.

See http://code.google.com/p/v8/issues/detail?id=884