build: upgrade rustc to 1.81.0 (#34270)

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>

components/layout_2020/dom_traversal.rs

@@ -448,9 +448,8 @@ where
 {
     let mut next = parent.first_child();
     std::iter::from_fn(move || {
-        next.map(|child| {
+        next.inspect(|child| {
             next = child.next_sibling();
-            child
         })
     })
 }

components/layout_2020/flow/inline/construct.rs

@@ -232,13 +232,12 @@ impl InlineFormattingContextBuilder {
 
         let white_space_collapse = info.style.clone_white_space_collapse();
         let new_text: String = char_iterator
-            .map(|character| {
+            .inspect(|&character| {
                 self.has_uncollapsible_text_content |= matches!(
                     white_space_collapse,
                     WhiteSpaceCollapse::Preserve | WhiteSpaceCollapse::BreakSpaces
                 ) || !character.is_ascii_whitespace() ||
                     (character == '\n' && white_space_collapse != WhiteSpaceCollapse::Collapse);
-                character
             })
             .collect();
 

components/net/image_cache.rs

@@ -125,7 +125,7 @@ impl AllPendingLoads {
     }
 
     fn remove(&mut self, key: &LoadKey) -> Option<PendingLoad> {
-        self.loads.remove(key).map(|pending_load| {
+        self.loads.remove(key).inspect(|pending_load| {
             self.url_to_load_key
                 .remove(&(
                     pending_load.url.clone(),
@@ -133,7 +133,6 @@ impl AllPendingLoads {
                     pending_load.cors_setting,
                 ))
                 .unwrap();
-            pending_load
         })
     }
 

components/net/storage_thread.rs

@@ -244,9 +244,8 @@ impl StorageManager {
         let old_value = data
             .get_mut(&origin)
             .and_then(|&mut (ref mut total, ref mut entry)| {
-                entry.remove(&name).map(|old| {
+                entry.remove(&name).inspect(|old| {
                     *total -= name.as_bytes().len() + old.as_bytes().len();
-                    old
                 })
             });
         sender.send(old_value).unwrap();

components/script/body.rs

@@ -873,11 +873,7 @@ fn run_form_data_algorithm(
     mime: &[u8],
     can_gc: CanGc,
 ) -> Fallible<FetchedData> {
-    let mime_str = if let Ok(s) = str::from_utf8(mime) {
-        s
-    } else {
-        ""
-    };
+    let mime_str = str::from_utf8(mime).unwrap_or_default();
     let mime: Mime = mime_str
         .parse()
         .map_err(|_| Error::Type("Inappropriate MIME-type for Body".to_string()))?;

components/script/textinput.rs

@@ -1037,7 +1037,7 @@ impl<T: ClipboardProvider> TextInput<T> {
             // https://html.spec.whatwg.org/multipage/#textarea-line-break-normalisation-transformation
             content
                 .replace("\r\n", "\n")
-                .split(|c| c == '\n' || c == '\r')
+                .split(['\n', '\r'])
                 .map(DOMString::from)
                 .collect()
         } else {