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/globalscope.rs

@@ -10,7 +10,7 @@ use dom::bindings::conversions::root_from_object;
 use dom::bindings::error::{ErrorInfo, report_pending_exception};
 use dom::bindings::inheritance::Castable;
 use dom::bindings::reflector::DomObject;
-use dom::bindings::root::{MutNullableDom, Root};
+use dom::bindings::root::{DomRoot, MutNullableDom};
 use dom::bindings::settings_stack::{AutoEntryScript, entry_global, incumbent_global};
 use dom::bindings::str::DOMString;
 use dom::crypto::Crypto;
@@ -148,13 +148,13 @@ impl GlobalScope {
     /// Returns the global scope of the realm that the given DOM object's reflector
     /// was created in.
     #[allow(unsafe_code)]
-    pub fn from_reflector<T: DomObject>(reflector: &T) -> Root<Self> {
+    pub fn from_reflector<T: DomObject>(reflector: &T) -> DomRoot<Self> {
         unsafe { GlobalScope::from_object(*reflector.reflector().get_jsobject()) }
     }
 
     /// Returns the global scope of the realm that the given JS object was created in.
     #[allow(unsafe_code)]
-    pub unsafe fn from_object(obj: *mut JSObject) -> Root<Self> {
+    pub unsafe fn from_object(obj: *mut JSObject) -> DomRoot<Self> {
         assert!(!obj.is_null());
         let global = GetGlobalForObjectCrossCompartment(obj);
         global_scope_from_global(global)
@@ -162,7 +162,7 @@ impl GlobalScope {
 
     /// Returns the global scope for the given JSContext
     #[allow(unsafe_code)]
-    pub unsafe fn from_context(cx: *mut JSContext) -> Root<Self> {
+    pub unsafe fn from_context(cx: *mut JSContext) -> DomRoot<Self> {
         let global = CurrentGlobalOrNull(cx);
         global_scope_from_global(global)
     }
@@ -170,7 +170,7 @@ impl GlobalScope {
     /// Returns the global object of the realm that the given JS object
     /// was created in, after unwrapping any wrappers.
     #[allow(unsafe_code)]
-    pub unsafe fn from_object_maybe_wrapped(mut obj: *mut JSObject) -> Root<Self> {
+    pub unsafe fn from_object_maybe_wrapped(mut obj: *mut JSObject) -> DomRoot<Self> {
         if IsWrapper(obj) {
             obj = UnwrapObject(obj, /* stopAtWindowProxy = */ 0);
             assert!(!obj.is_null());
@@ -190,7 +190,7 @@ impl GlobalScope {
         }
     }
 
-    pub fn crypto(&self) -> Root<Crypto> {
+    pub fn crypto(&self) -> DomRoot<Crypto> {
         self.crypto.or_init(|| Crypto::new(self))
     }
 
@@ -496,7 +496,7 @@ impl GlobalScope {
 
     /// Perform a microtask checkpoint.
     pub fn perform_a_microtask_checkpoint(&self) {
-        self.microtask_queue.checkpoint(|_| Some(Root::from_ref(self)));
+        self.microtask_queue.checkpoint(|_| Some(DomRoot::from_ref(self)));
     }
 
     /// Enqueue a microtask for subsequent execution.
@@ -550,7 +550,7 @@ impl GlobalScope {
     ///
     /// ["current"]: https://html.spec.whatwg.org/multipage/#current
     #[allow(unsafe_code)]
-    pub fn current() -> Option<Root<Self>> {
+    pub fn current() -> Option<DomRoot<Self>> {
         unsafe {
             let cx = Runtime::get();
             assert!(!cx.is_null());
@@ -566,18 +566,18 @@ impl GlobalScope {
     /// Returns the ["entry"] global object.
     ///
     /// ["entry"]: https://html.spec.whatwg.org/multipage/#entry
-    pub fn entry() -> Root<Self> {
+    pub fn entry() -> DomRoot<Self> {
         entry_global()
     }
 
     /// Returns the ["incumbent"] global object.
     ///
     /// ["incumbent"]: https://html.spec.whatwg.org/multipage/#incumbent
-    pub fn incumbent() -> Option<Root<Self>> {
+    pub fn incumbent() -> Option<DomRoot<Self>> {
         incumbent_global()
     }
 
-    pub fn performance(&self) -> Root<Performance> {
+    pub fn performance(&self) -> DomRoot<Performance> {
         if let Some(window) = self.downcast::<Window>() {
             return window.Performance();
         }
@@ -607,7 +607,7 @@ fn timestamp_in_ms(time: Timespec) -> u64 {
 
 /// Returns the Rust global scope from a JS global object.
 #[allow(unsafe_code)]
-unsafe fn global_scope_from_global(global: *mut JSObject) -> Root<GlobalScope> {
+unsafe fn global_scope_from_global(global: *mut JSObject) -> DomRoot<GlobalScope> {
     assert!(!global.is_null());
     let clasp = get_object_class(global);
     assert!(((*clasp).flags & (JSCLASS_IS_DOMJSCLASS | JSCLASS_IS_GLOBAL)) != 0);