Revert "Backport several style changes from Gecko (5) (#30099)" (#30104)

This reverts commit 8e15389cae.

components/selectors/context.rs

@@ -68,14 +68,6 @@ impl VisitedHandlingMode {
     }
 }
 
-/// Whether we need to set selector invalidation flags on elements for this
-/// match request.
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub enum NeedsSelectorFlags {
-    No,
-    Yes,
-}
-
 /// Which quirks mode is this document in.
 ///
 /// See: https://quirks.spec.whatwg.org/
@@ -148,7 +140,6 @@ where
     pub extra_data: Impl::ExtraMatchingData,
 
     quirks_mode: QuirksMode,
-    needs_selector_flags: NeedsSelectorFlags,
     classes_and_ids_case_sensitivity: CaseSensitivity,
     _impl: ::std::marker::PhantomData<Impl>,
 }
@@ -163,7 +154,6 @@ where
         bloom_filter: Option<&'a BloomFilter>,
         nth_index_cache: Option<&'a mut NthIndexCache>,
         quirks_mode: QuirksMode,
-        needs_selector_flags: NeedsSelectorFlags,
     ) -> Self {
         Self::new_for_visited(
             matching_mode,
@@ -171,7 +161,6 @@ where
             nth_index_cache,
             VisitedHandlingMode::AllLinksUnvisited,
             quirks_mode,
-            needs_selector_flags,
         )
     }
 
@@ -182,7 +171,6 @@ where
         nth_index_cache: Option<&'a mut NthIndexCache>,
         visited_handling: VisitedHandlingMode,
         quirks_mode: QuirksMode,
-        needs_selector_flags: NeedsSelectorFlags,
     ) -> Self {
         Self {
             matching_mode,
@@ -191,7 +179,6 @@ where
             nth_index_cache,
             quirks_mode,
             classes_and_ids_case_sensitivity: quirks_mode.classes_and_ids_case_sensitivity(),
-            needs_selector_flags,
             scope_element: None,
             current_host: None,
             nesting_level: 0,
@@ -226,12 +213,6 @@ where
         self.matching_mode
     }
 
-    /// Whether we need to set selector flags.
-    #[inline]
-    pub fn needs_selector_flags(&self) -> bool {
-        self.needs_selector_flags == NeedsSelectorFlags::Yes
-    }
-
     /// The case-sensitivity for class and ID selectors
     #[inline]
     pub fn classes_and_ids_case_sensitivity(&self) -> CaseSensitivity {