Rename Root<T> to DomRoot<T>

In a later PR, DomRoot<T> will become a type alias of Root<Dom<T>>,
where Root<T> will be able to handle all the things that need to be
rooted that have a stable traceable address that doesn't move for the
whole lifetime of the root. Stay tuned.

components/script/dom/webglrenderbuffer.rs

@@ -7,7 +7,7 @@ use canvas_traits::webgl::{webgl_channel, WebGLCommand, WebGLError, WebGLMsgSend
 use dom::bindings::codegen::Bindings::WebGLRenderbufferBinding;
 use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
 use dom::bindings::reflector::reflect_dom_object;
-use dom::bindings::root::Root;
+use dom::bindings::root::DomRoot;
 use dom::webglobject::WebGLObject;
 use dom::window::Window;
 use dom_struct::dom_struct;
@@ -41,7 +41,7 @@ impl WebGLRenderbuffer {
     }
 
     pub fn maybe_new(window: &Window, renderer: WebGLMsgSender)
-                     -> Option<Root<WebGLRenderbuffer>> {
+                     -> Option<DomRoot<WebGLRenderbuffer>> {
         let (sender, receiver) = webgl_channel().unwrap();
         renderer.send(WebGLCommand::CreateRenderbuffer(sender)).unwrap();
 
@@ -52,7 +52,7 @@ impl WebGLRenderbuffer {
     pub fn new(window: &Window,
                renderer: WebGLMsgSender,
                id: WebGLRenderbufferId)
-               -> Root<WebGLRenderbuffer> {
+               -> DomRoot<WebGLRenderbuffer> {
         reflect_dom_object(box WebGLRenderbuffer::new_inherited(renderer, id),
                            window,
                            WebGLRenderbufferBinding::Wrap)