Oilpan: Remove Element* raw pointers in objects

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index 48285cfe5f3ed3e1b94445a53e7fbccbaa95a8f6..1a7b0fcfa3e6eef7a2eee93611040d4d363e0f89 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -341,7 +341,7 @@ StyleSharingList& StyleResolver::styleSharingList()
     unsigned depth = std::max(std::min(m_styleSharingDepth, styleSharingMaxDepth), 1u) - 1u;
 
     if (!m_styleSharingLists[depth])
-        m_styleSharingLists[depth] = adoptPtr(new StyleSharingList);
+        m_styleSharingLists[depth] = adoptPtrWillBeNoop(new StyleSharingList);
     return *m_styleSharingLists[depth];
 }
 
@@ -1562,6 +1562,7 @@ void StyleResolver::trace(Visitor* visitor)
     visitor->trace(m_uncommonAttributeRuleSet);
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingRules);
+    visitor->trace(m_styleSharingLists);
     visitor->trace(m_pendingStyleSheets);
     visitor->trace(m_styleTree);
     visitor->trace(m_scopedStyleResolvers);