Move CSSRuleList to the garbage collected heap

Source/core/dom/StyleSheetCollection.cpp

Index: Source/core/dom/StyleSheetCollection.cpp
diff --git a/Source/core/dom/StyleSheetCollection.cpp b/Source/core/dom/StyleSheetCollection.cpp
index 3696186242d15e88bfbb80b21e30271802532547..9187d67cf0b0cafb520fb161ddb145eceef0c9af 100644
--- a/Source/core/dom/StyleSheetCollection.cpp
+++ b/Source/core/dom/StyleSheetCollection.cpp
@@ -45,14 +45,14 @@ void StyleSheetCollection::swap(StyleSheetCollection& other)
     m_activeAuthorStyleSheets.swap(other.m_activeAuthorStyleSheets);
 }
 
-void StyleSheetCollection::swapSheetsForSheetList(Vector<RefPtr<StyleSheet> >& sheets)
+void StyleSheetCollection::swapSheetsForSheetList(WillBeHeapVector<RefPtrWillBeMember<StyleSheet> >& sheets)
 {
     // Only called for collection of HTML Imports that never has active sheets.
     ASSERT(m_activeAuthorStyleSheets.isEmpty());
     m_styleSheetsForStyleSheetList.swap(sheets);
 }
 
-void StyleSheetCollection::appendActiveStyleSheets(const Vector<RefPtr<CSSStyleSheet> >& sheets)
+void StyleSheetCollection::appendActiveStyleSheets(const WillBePersistentHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& sheets)
 {
     m_activeAuthorStyleSheets.appendVector(sheets);
 }