script: Don't use StyleSheet::update_from_str. (#40024)

I want to remove this stylo API and this is the only consumer. Instead
just parse a new style stylesheet.

Shouldn't change behavior.

Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>

components/script/dom/html/htmlstyleelement.rs

@@ -13,7 +13,9 @@ use script_bindings::root::Dom;
 use servo_arc::Arc;
 use style::media_queries::MediaList as StyleMediaList;
 use style::shared_lock::DeepCloneWithLock;
-use style::stylesheets::{AllowImportRules, Origin, Stylesheet, StylesheetContents, UrlExtraData};
+use style::stylesheets::{
+    AllowImportRules, Origin, Stylesheet, StylesheetContents, StylesheetInDocument, UrlExtraData,
+};
 
 use crate::dom::attr::Attr;
 use crate::dom::bindings::cell::DomRefCell;
@@ -164,7 +166,7 @@ impl HTMLStyleElement {
         );
 
         let sheet = Arc::new(Stylesheet {
-            contents,
+            contents: shared_lock.wrap(contents),
             shared_lock,
             media: mq,
             disabled: AtomicBool::new(false),
@@ -248,11 +250,11 @@ impl HTMLStyleElement {
         let lock = stylesheet_with_shared_contents.shared_lock.clone();
         let guard = stylesheet_with_shared_contents.shared_lock.read();
         let stylesheet_with_owned_contents = Arc::new(Stylesheet {
-            contents: Arc::new(
+            contents: lock.wrap(Arc::new(
                 stylesheet_with_shared_contents
-                    .contents
+                    .contents(&guard)
                     .deep_clone_with_lock(&lock, &guard),
-            ),
+            )),
             shared_lock: lock,
             media: stylesheet_with_shared_contents.media.clone(),
             disabled: AtomicBool::new(