Rename variables that refer to global objects.

This clarifies whether those variables will point to a Window object or an
arbitrary global object.

Note in particular that all IDL Constructors will accept an arbitrary global
object.

src/components/script/dom/bindings/utils.rs

@@ -373,10 +373,10 @@ pub trait Reflectable {
 
 pub fn reflect_dom_object<T: Reflectable>
         (obj:     Box<T>,
-         window:  &JSRef<window::Window>,
+         global:  &JSRef<window::Window>,
          wrap_fn: extern "Rust" fn(*mut JSContext, &JSRef<window::Window>, Box<T>) -> Temporary<T>)
          -> Temporary<T> {
-    wrap_fn(window.get_cx(), window, obj)
+    wrap_fn(global.get_cx(), global, obj)
 }
 
 #[allow(raw_pointer_deriving)]