std: Stabilize the rest of Any/BoxAny

This commit stabilizes the following APIs:

* `TypeId::of` - now that it has an `Any` bound it's ready to be stable.
* `Box<Any>::downcast` - now that an inherent impl on `Box<Any>` as well as
  `Box<Any+Send>` is allowed the `BoxAny` trait is removed in favor of these
  inherent methods.

This is a breaking change due to the removal of the `BoxAny` trait, but
consumers can simply remove imports to fix crates.

[breaking-change]

1 files changed, 0 insertions, 1 deletions

diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index 074030bd07b..863291ff542 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -810,7 +810,6 @@ mod test {
 
     use any::Any;
     use sync::mpsc::{channel, Sender};
-    use boxed::BoxAny;
     use result;
     use std::old_io::{ChanReader, ChanWriter};
     use super::{Builder};