Update to rustc 1.7.0-nightly (b4707ebca 2015-12-27)

components/layout/context.rs

@@ -4,7 +4,8 @@
 
 //! Data needed by the layout thread.
 
-#![deny(unsafe_code)]
+// for thread_local
+#![allow(unsafe_code)]
 
 use app_units::Au;
 use canvas_traits::CanvasMsg;

components/layout/layout_debug.rs

@@ -5,6 +5,9 @@
 //! Supports writing a trace file created during each layout scope
 //! that can be viewed by an external tool to make layout debugging easier.
 
+// for thread_local
+#![allow(unsafe_code)]
+
 use flow;
 use flow_ref::FlowRef;
 use rustc_serialize::json;

components/layout/traversal.rs

@@ -4,6 +4,9 @@
 
 //! Traversals over the DOM and flow trees, running the layout computations.
 
+// For thread_local.
+#![allow(unsafe_code)]
+
 use construct::FlowConstructor;
 use context::{LayoutContext, SharedLayoutContext};
 use flow::{PostorderFlowTraversal, PreorderFlowTraversal};