Revert "std: convert {vec,str}::to_owned to methods."

This fixes the strange random crashes in compile-fail tests.

This reverts commit 96cd61ad03.

Conflicts:
	src/librustc/driver/driver.rs
	src/libstd/str.rs
	src/libsyntax/ext/quote.rs

src/libsyntax/ext/asm.rs

@@ -14,6 +14,7 @@
 
 use core::prelude::*;
 
+use core::vec;
 use ast;
 use codemap::span;
 use ext::base;
@@ -43,7 +44,7 @@ pub fn expand_asm(cx: @ExtCtxt, sp: span, tts: &[ast::token_tree])
                -> base::MacResult {
     let p = parse::new_parser_from_tts(cx.parse_sess(),
                                        cx.cfg(),
-                                       tts.to_owned());
+                                       vec::to_owned(tts));
 
     let mut asm = @"";
     let mut outputs = ~[];