style: Update Gecko bindings.

components/style/gecko/generated/bindings.rs

@@ -507,7 +507,7 @@ extern "C" {
                                     whitespace_is_significant: bool) -> bool;
 }
 extern "C" {
-    pub fn Gecko_GetParentNode(node: RawGeckoNodeBorrowed)
+    pub fn Gecko_GetFlattenedTreeParentNode(node: RawGeckoNodeBorrowed)
      -> RawGeckoNodeBorrowedOrNull;
 }
 extern "C" {
@@ -567,6 +567,11 @@ extern "C" {
     pub fn Gecko_GetNextStyleChild(it: StyleChildrenIteratorBorrowedMut)
      -> RawGeckoNodeBorrowedOrNull;
 }
+extern "C" {
+    pub fn Gecko_ElementHasBindingWithAnonymousContent(element:
+                                                           RawGeckoElementBorrowed)
+     -> bool;
+}
 extern "C" {
     pub fn Gecko_ElementState(element: RawGeckoElementBorrowed) -> u64;
 }