style: Miscellaneous Servo build fixes.

components/style/properties/properties.mako.rs

@@ -2902,6 +2902,7 @@ pub struct ComputedValues {
 
 impl ComputedValues {
     /// Returns the pseudo-element that this style represents.
+    #[cfg(feature = "servo")]
     pub fn pseudo(&self) -> Option<<&PseudoElement> {
         self.pseudo.as_ref()
     }

components/style/rule_tree/mod.rs

@@ -1718,6 +1718,7 @@ impl Clone for StrongRuleNode {
 }
 
 impl Drop for StrongRuleNode {
+    #[cfg_attr(feature = "servo", allow(unused_mut))]
     fn drop(&mut self) {
         let node = unsafe { &*self.ptr() };
 

components/style/values/computed/length_percentage.rs

@@ -378,6 +378,19 @@ impl LengthPercentage {
         }
     }
 
+    /// Converts to a `<percentage>` if possible.
+    #[inline]
+    pub fn to_percentage(&self) -> Option<Percentage> {
+        match self.unpack() {
+            Unpacked::Length(..) => None,
+            Unpacked::Percentage(p) => Some(p),
+            Unpacked::Calc(ref c) => {
+                debug_assert!(!c.length.is_zero());
+                None
+            }
+        }
+    }
+
     /// Return the specified percentage if any.
     #[inline]
     pub fn specified_percentage(&self) -> Option<Percentage> {
@@ -405,7 +418,7 @@ impl LengthPercentage {
 
     /// Convert the computed value into used value.
     #[inline]
-    fn maybe_to_used_value(&self, container_len: Option<Length>) -> Option<Au> {
+    pub fn maybe_to_used_value(&self, container_len: Option<Length>) -> Option<Au> {
         self.maybe_percentage_relative_to(container_len).map(Au::from)
     }
 

components/style/values/generics/counters.rs

@@ -168,8 +168,9 @@ pub enum GenericContent<ImageUrl> {
 pub use self::GenericContent as Content;
 
 impl<ImageUrl> Content<ImageUrl> {
+    /// Whether `self` represents list of items.
     #[inline]
-    pub(crate) fn is_items(&self) -> bool {
+    pub fn is_items(&self) -> bool {
         matches!(*self, Self::Items(..))
     }
 

components/style/values/specified/counters.rs

@@ -113,6 +113,7 @@ impl Parse for Content {
     // normal | none | [ <string> | <counter> | open-quote | close-quote | no-open-quote |
     // no-close-quote ]+
     // TODO: <uri>, attr(<identifier>)
+    #[cfg_attr(feature = "servo", allow(unused_mut))]
     fn parse<'i, 't>(
         context: &ParserContext,
         input: &mut Parser<'i, 't>,