Auto merge of #10327 - frewsxcv:get-prefix, r=ms2ger

Remove `get_*` on getters as per RFC 0344.

https://github.com/rust-lang/rfcs/blob/master/text/0344-conventions-galore.md#gettersetter-apis

https://github.com/servo/servo/issues/6224

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components/script/dom/document.rs

@@ -356,7 +356,7 @@ impl Document {
         // that workable.
         match self.GetDocumentElement() {
             Some(root) => {
-                root.upcast::<Node>().get_has_dirty_descendants() ||
+                root.upcast::<Node>().has_dirty_descendants() ||
                 !self.modified_elements.borrow().is_empty()
             }
             None => false,