Stop using macro_escape as an inner attribute

In preparation for the rename.

src/libsyntax/parse/parser.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![macro_escape]
-
 pub use self::PathParsingMode::*;
 use self::ItemOrViewItem::*;