std: unify the str -> [u8] functions as 3 methods: .as_bytes() and .as_bytes_with_null[_consume]().

The first acts on &str and is not nul-terminated, the last two act on strings
that are always null terminated (&'static str, ~str and @str).

src/libsyntax/ext/asm.rs

@@ -21,8 +21,6 @@ use ext::base::*;
 use parse;
 use parse::token;
 
-use core::vec;
-
 enum State {
     Asm,
     Outputs,

src/libsyntax/ext/base.rs

@@ -22,7 +22,6 @@ use parse::token;
 use parse::token::{ident_to_str, intern, str_to_ident};
 
 use core::hashmap::HashMap;
-use core::vec;
 
 // new-style macro! tt code:
 //

src/libsyntax/ext/log_syntax.rs

@@ -18,7 +18,6 @@ use print;
 use parse::token::{get_ident_interner};
 
 use core::io;
-use core::vec;
 
 pub fn expand_syntax_ext(cx: @ExtCtxt,
                          sp: codemap::span,

src/libsyntax/ext/quote.rs

@@ -19,8 +19,6 @@ use parse::token::*;
 use parse::token;
 use parse;
 
-use core::vec;
-
 /**
 *
 * Quasiquoting works via token trees.

src/libsyntax/ext/trace_macros.rs

@@ -18,8 +18,6 @@ use parse::lexer::{new_tt_reader, reader};
 use parse::parser::Parser;
 use parse::token::keywords;
 
-use core::vec;
-
 pub fn expand_trace_macros(cx: @ExtCtxt,
                            sp: span,
                            tt: &[ast::token_tree])

src/libsyntax/ext/tt/macro_rules.rs

@@ -26,7 +26,6 @@ use parse::token::{FAT_ARROW, SEMI, nt_matchers, nt_tt};
 use print;
 
 use core::io;
-use core::vec;
 
 pub fn add_new_extension(cx: @ExtCtxt,
                          sp: span,