Honor DebuggerBrowsable(DebuggerBrowsableState.Never)

```
See: http://msdn.microsoft.com/en-us/library/ms228992.aspx

In the future we may consider honoring some of the other DebuggerBrowsable 
options, but for now we just stick with this one.
```

Original issue reported on code.google.com by `stephen....@gmail.com` on 20 Jul 2011 at 6:39
