servo: Update for latest language changes

Source-Repo: https://github.com/servo/servo
Source-Revision: a6d9b123e4fc5b5de2d9f10199dc6ef62402eb0d

servo/src/servo/gfx/pngsink.rs

@@ -76,7 +76,7 @@ fn do_draw(sender: chan<AzDrawTargetRef>,
            output: chan<[u8]>,
            cairo_surf: *cairo_surface_t) {
 
-    listen {|data_ch|
+    listen {|data_ch: chan<[u8]>|
 
         crust fn write_fn(closure: *c_void,
                           data: *c_uchar,

servo/src/servo/net.rs

@@ -17,7 +17,7 @@ iface io_service {
     fn new_channel(uri: uri) -> channel;
 }
 
-class file_channel implements channel {
+class file_channel: channel {
     let bogus : int;
 
     new() {

servo/src/servo/parser/css_lexer.rs

@@ -230,7 +230,7 @@ fn spawn_css_lexer_task(-filename: ~str) -> port<Token> {
         // otherwise just send an eof.  This is a hack to allow
         // guessing that if foo.html exists, foo.css is the
         // corresponding stylesheet.
-        if file_try.is_success() {
+        if file_try.is_ok() {
             #debug["Lexing css sheet %s", *copy filename];
             let file_data = file_try.get();
             let reader = io::bytes_reader(file_data);

servo/src/servo/servo.rs

@@ -1,5 +1,4 @@
 import comm::*;
-import result::extensions;
 import gfx::renderer;
 import platform::osmain;
 import osmain::{OSMain, AddKeyHandler};