PurgeMemory.

third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp

Index: third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp b/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
index 6e8becc9192f1ccc4ecfb86645254a3f3455f048..bcd99e8b039ac66e5230846ff486219241b60c5b 100644
--- a/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
@@ -59,6 +59,15 @@ void StyleSheetCollection::appendSheetForList(StyleSheet* sheet)
     m_styleSheetsForStyleSheetList.append(sheet);
 }
 
+void StyleSheetCollection::purgeMemory()
+{
+    WillBeHeapVector<RefPtrWillBeMember<StyleSheet>>::iterator it = m_styleSheetsForStyleSheetList.begin();
+    while (it != m_styleSheetsForStyleSheetList.end()) {
+        (*it)->purgeMemory();
+        ++it;
+    }
+}
+
 DEFINE_TRACE(StyleSheetCollection)
 {
     visitor->trace(m_activeAuthorStyleSheets);