style: Remove unnecessary TraversalFlags::FOR_DEFAULT_STYLES.

Yay

MozReview-Commit-ID: JiWTEz63AlE

components/style/traversal.rs

@@ -42,8 +42,6 @@ bitflags! {
         /// Traverse and update all elements with CSS animations since
         /// @keyframes rules may have changed
         const FOR_CSS_RULE_CHANGES = 0x08,
-        /// Only include user agent style sheets when selector matching.
-        const FOR_DEFAULT_STYLES = 0x10,
     }
 }
 
@@ -67,12 +65,6 @@ impl TraversalFlags {
     pub fn for_css_rule_changes(&self) -> bool {
         self.contains(FOR_CSS_RULE_CHANGES)
     }
-
-    /// Returns true if the traversal is to compute the default computed styles
-    /// for an element.
-    pub fn for_default_styles(&self) -> bool {
-        self.contains(FOR_DEFAULT_STYLES)
-    }
 }
 
 /// This structure exists to enforce that callers invoke pre_traverse, and also

ports/geckolib/glue.rs

@@ -113,7 +113,7 @@ use style::stylist::RuleInclusion;
 use style::thread_state;
 use style::timer::Timer;
 use style::traversal::{ANIMATION_ONLY, DomTraversal, FOR_CSS_RULE_CHANGES, FOR_RECONSTRUCT};
-use style::traversal::{FOR_DEFAULT_STYLES, TraversalDriver, TraversalFlags, UNSTYLED_CHILDREN_ONLY};
+use style::traversal::{TraversalDriver, TraversalFlags, UNSTYLED_CHILDREN_ONLY};
 use style::traversal::resolve_style;
 use style::values::{CustomIdent, KeyframesName};
 use style::values::computed::Context;
@@ -2797,16 +2797,11 @@ pub extern "C" fn Servo_ResolveStyleLazily(element: RawGeckoElementBorrowed,
         }
     }
 
-    let traversal_flags = match rule_inclusion {
-        RuleInclusion::All => TraversalFlags::empty(),
-        RuleInclusion::DefaultOnly => FOR_DEFAULT_STYLES,
-    };
-
     // We don't have the style ready. Go ahead and compute it as necessary.
     let shared = create_shared_context(&global_style_data,
                                        &guard,
                                        &data,
-                                       traversal_flags,
+                                       TraversalFlags::empty(),
                                        unsafe { &*snapshots });
     let mut tlc = ThreadLocalStyleContext::new(&shared);
     let mut context = StyleContext {