Improve tracing for sibling style invalidation

third_party/WebKit/Source/core/css/RuleFeature.cpp

Index: third_party/WebKit/Source/core/css/RuleFeature.cpp
diff --git a/third_party/WebKit/Source/core/css/RuleFeature.cpp b/third_party/WebKit/Source/core/css/RuleFeature.cpp
index 75a438c2cd8c019949eb4749be97435e2192f812..b3aea5071d480bc51529941dba44bd6488582912 100644
--- a/third_party/WebKit/Source/core/css/RuleFeature.cpp
+++ b/third_party/WebKit/Source/core/css/RuleFeature.cpp
@@ -608,8 +608,7 @@ void RuleFeatureSet::collectInvalidationSetsForClass(InvalidationLists& invalida
             invalidationLists.descendants.append(invalidationData->descendants());
         }
         if (invalidationData->siblings()) {
-            if (element.parentElement())
-                TRACE_SCHEDULE_STYLE_INVALIDATION(*element.parentElement(), *invalidationData->siblings(), classChange, className);
+            TRACE_SCHEDULE_STYLE_INVALIDATION(element, *invalidationData->siblings(), classChange, className);
             invalidationLists.siblings.append(invalidationData->siblings());
         }
     }
@@ -623,8 +622,7 @@ void RuleFeatureSet::collectInvalidationSetsForId(InvalidationLists& invalidatio
             invalidationLists.descendants.append(invalidationData->descendants());
         }
         if (invalidationData->siblings()) {
-            if (element.parentElement())
-                TRACE_SCHEDULE_STYLE_INVALIDATION(*element.parentElement(), *invalidationData->siblings(), idChange, id);
+            TRACE_SCHEDULE_STYLE_INVALIDATION(element, *invalidationData->siblings(), idChange, id);
             invalidationLists.siblings.append(invalidationData->siblings());
         }
     }
@@ -638,8 +636,7 @@ void RuleFeatureSet::collectInvalidationSetsForAttribute(InvalidationLists& inva
             invalidationLists.descendants.append(invalidationData->descendants());
         }
         if (invalidationData->siblings()) {
-            if (element.parentElement())
-                TRACE_SCHEDULE_STYLE_INVALIDATION(*element.parentElement(), *invalidationData->siblings(), attributeChange, attributeName);
+            TRACE_SCHEDULE_STYLE_INVALIDATION(element, *invalidationData->siblings(), attributeChange, attributeName);
             invalidationLists.siblings.append(invalidationData->siblings());
         }
     }
@@ -653,8 +650,7 @@ void RuleFeatureSet::collectInvalidationSetsForPseudoClass(InvalidationLists& in
             invalidationLists.descendants.append(invalidationData->descendants());
         }
         if (invalidationData->siblings()) {
-            if (element.parentElement())
-                TRACE_SCHEDULE_STYLE_INVALIDATION(*element.parentElement(), *invalidationData->siblings(), pseudoChange, pseudo);
+            TRACE_SCHEDULE_STYLE_INVALIDATION(element, *invalidationData->siblings(), pseudoChange, pseudo);
             invalidationLists.siblings.append(invalidationData->siblings());
         }
     }