Use the correct log crate and setup env_logger in main.

components/layout/Cargo.toml

@@ -68,6 +68,7 @@ git = "https://github.com/servo/rust-png"
 git = "https://github.com/tomaka/clock_ticks"
 
 [dependencies]
+log = "*"
 encoding = "0.2"
 url = "0.2.35"
 bitflags = "*"

components/layout/layout_task.rs

@@ -889,7 +889,7 @@ impl LayoutTask {
         };
 
         debug!("layout: received layout request for: {}", self.url.serialize());
-        if log_enabled!(log::DEBUG) {
+        if log_enabled!(log::LogLevel::Debug) {
             node.dump();
         }
 

components/layout/lib.rs

@@ -8,7 +8,6 @@
 #![feature(core)]
 #![feature(filling_drop)]
 #![feature(plugin)]
-#![feature(rustc_private)]
 #![feature(std_misc)]
 #![feature(str_char)]
 #![feature(thread_local)]