clippy: Fix more clippy warnings in components/scripts/dom (#31914)

* refrence to a reference

* refrence to a reference

components/script/dom/urlsearchparams.rs

@@ -131,7 +131,7 @@ impl URLSearchParamsMethods for URLSearchParams {
         let list = self.list.borrow();
         list.iter()
             .find(|&kv| kv.0 == name.0)
-            .map(|ref kv| USVString(kv.1.clone()))
+            .map(|kv| USVString(kv.1.clone()))
     }
 
     // https://url.spec.whatwg.org/#dom-urlsearchparams-getall

components/script/dom/vertexarrayobject.rs

@@ -293,7 +293,7 @@ impl Default for VertexAttribData {
 
 impl VertexAttribData {
     pub fn buffer(&self) -> Option<&WebGLBuffer> {
-        self.buffer.as_ref().map(|b| &**b)
+        self.buffer.as_deref()
     }
 
     pub fn max_vertices(&self) -> u32 {

components/script/dom/virtualmethods.rs

@@ -86,7 +86,7 @@ pub trait VirtualMethods {
     /// on this element.
     fn parse_plain_attribute(&self, name: &LocalName, value: DOMString) -> AttrValue {
         match self.super_type() {
-            Some(ref s) => s.parse_plain_attribute(name, value),
+            Some(s) => s.parse_plain_attribute(name, value),
             _ => AttrValue::String(value.into()),
         }
     }
@@ -94,7 +94,7 @@ pub trait VirtualMethods {
     /// Called when a Node is appended to a tree, where 'tree_connected' indicates
     /// whether the tree is part of a Document.
     fn bind_to_tree(&self, context: &BindContext) {
-        if let Some(ref s) = self.super_type() {
+        if let Some(s) = self.super_type() {
             s.bind_to_tree(context);
         }
     }
@@ -104,14 +104,14 @@ pub trait VirtualMethods {
     /// Implements removing steps:
     /// <https://dom.spec.whatwg.org/#concept-node-remove-ext>
     fn unbind_from_tree(&self, context: &UnbindContext) {
-        if let Some(ref s) = self.super_type() {
+        if let Some(s) = self.super_type() {
             s.unbind_from_tree(context);
         }
     }
 
     /// Called on the parent when its children are changed.
     fn children_changed(&self, mutation: &ChildrenMutation) {
-        if let Some(ref s) = self.super_type() {
+        if let Some(s) = self.super_type() {
             s.children_changed(mutation);
         }
     }
@@ -125,7 +125,7 @@ pub trait VirtualMethods {
 
     /// <https://dom.spec.whatwg.org/#concept-node-adopt-ext>
     fn adopting_steps(&self, old_doc: &Document) {
-        if let Some(ref s) = self.super_type() {
+        if let Some(s) = self.super_type() {
             s.adopting_steps(old_doc);
         }
     }
@@ -137,7 +137,7 @@ pub trait VirtualMethods {
         maybe_doc: Option<&Document>,
         clone_children: CloneChildrenFlag,
     ) {
-        if let Some(ref s) = self.super_type() {
+        if let Some(s) = self.super_type() {
             s.cloning_steps(copy, maybe_doc, clone_children);
         }
     }
@@ -145,7 +145,7 @@ pub trait VirtualMethods {
     /// Called on an element when it is popped off the stack of open elements
     /// of a parser.
     fn pop(&self) {
-        if let Some(ref s) = self.super_type() {
+        if let Some(s) = self.super_type() {
             s.pop();
         }
     }

components/script/dom/windowproxy.rs

@@ -831,7 +831,7 @@ fn tokenize_open_features(features: DOMString) -> IndexMap<String, String> {
 fn parse_open_feature_boolean(tokenized_features: &IndexMap<String, String>, name: &str) -> bool {
     if let Some(value) = tokenized_features.get(name) {
         // Step 1 & 2
-        if value == "" || value == "yes" {
+        if value.is_empty() || value == "yes" {
             return true;
         }
         // Step 3 & 4

components/script/dom/worker.rs

@@ -118,7 +118,7 @@ impl Worker {
 
         let (devtools_sender, devtools_receiver) = ipc::channel().unwrap();
         let worker_id = WorkerId(Uuid::new_v4());
-        if let Some(ref chan) = global.devtools_chan() {
+        if let Some(chan) = global.devtools_chan() {
             let pipeline_id = global.pipeline_id();
             let title = format!("Worker for {}", worker_url);
             if let Some(browsing_context) = browsing_context {