Remove unneeded imports now that #1873 seems to be fixed

Author: lkuper

src/rustc/middle/trans/base.rs

@@ -47,7 +47,6 @@ import build::*;
 import shape::*;
 import type_of::*;
 import common::*;
-import type_of::type_of; // Issue #1873
 import common::result;
 import syntax::ast_map::{path, path_mod, path_name};
 

src/rustc/middle/trans/closure.rs

@@ -7,7 +7,6 @@ import common::*;
 import build::*;
 import base::*;
 import type_of::*;
-import type_of::type_of; // Issue #1873
 import back::abi;
 import syntax::codemap::span;
 import syntax::print::pprust::expr_to_str;