RuleSet: change CompactRules and Trace to follow definition order

This CL adds missing rules member attributes and fixes the ordering in
both CompactRules() and Trace() to follow the ordering in the class
definition.

Change-Id: Icfa58c6a10c2a7e0c5a28807ed5af975693d9d5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601361Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/master@{#839211}

third_party/blink/renderer/core/css/rule_set.cc

@@ -531,12 +531,14 @@ void RuleSet::CompactRules() {
   spatial_navigation_interest_class_rules_.ShrinkToFit();
   universal_rules_.ShrinkToFit();
   shadow_host_rules_.ShrinkToFit();
+  part_pseudo_rules_.ShrinkToFit();
+  visited_dependent_rules_.ShrinkToFit();
   page_rules_.ShrinkToFit();
   font_face_rules_.ShrinkToFit();
   keyframes_rules_.ShrinkToFit();
-  counter_style_rules_.ShrinkToFit();
   property_rules_.ShrinkToFit();
-  part_pseudo_rules_.ShrinkToFit();
+  counter_style_rules_.ShrinkToFit();
+  scroll_timeline_rules_.ShrinkToFit();
   slotted_pseudo_element_rules_.ShrinkToFit();
 }
 
@@ -602,14 +604,14 @@ void RuleSet::Trace(Visitor* visitor) const {
   visitor->Trace(spatial_navigation_interest_class_rules_);
   visitor->Trace(universal_rules_);
   visitor->Trace(shadow_host_rules_);
+  visitor->Trace(part_pseudo_rules_);
+  visitor->Trace(visited_dependent_rules_);
   visitor->Trace(page_rules_);
   visitor->Trace(font_face_rules_);
   visitor->Trace(keyframes_rules_);
   visitor->Trace(property_rules_);
   visitor->Trace(counter_style_rules_);
   visitor->Trace(scroll_timeline_rules_);
-  visitor->Trace(part_pseudo_rules_);
-  visitor->Trace(visited_dependent_rules_);
   visitor->Trace(slotted_pseudo_element_rules_);
   visitor->Trace(pending_rules_);
 #ifndef NDEBUG