Script: Change script/dom/{bluetooth,canvas,html} to not rely on Deref<str> for DOMString (#39480)

This is part of the future work of implementing LazyDOMString as
outlined in https://github.com/servo/servo/issues/39479.

We use str() method or direct implementations on DOMString for these
methods. We also change some types.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>


Testing: This is essentially just renaming a method and a type and
should not change functionality.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>

components/script/dom/bluetooth/bluetoothuuid.rs

@@ -638,7 +638,7 @@ fn resolve_uuid_name(
         StringOrUnsignedLong::String(dstring) => {
             // Step 2.
             let regex = Regex::new(VALID_UUID_REGEX).unwrap();
-            if regex.is_match(&dstring) {
+            if regex.is_match(dstring.str()) {
                 Ok(dstring)
             } else {
                 // Step 3.