ensureStyleSheetCollectionFor  169 Source/core/dom/StyleEngine.cpp     return ensureStyleSheetCollectionFor(treeScope)->styleSheetsForStyleSheetList();
ensureStyleSheetCollectionFor  290 Source/core/dom/StyleEngine.cpp     TreeScopeStyleSheetCollection* collection = ensureStyleSheetCollectionFor(treeScope);
ensureStyleSheetCollectionFor  196 Source/core/dom/StyleEngine.h     TreeScopeStyleSheetCollection* ensureStyleSheetCollectionFor(TreeScope&);