PurgeMemory.

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

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 167 matching lines @@
 }
 
 PassRefPtrWillBeRawPtr<CSSImageSetValue> CSSImageSetValue::valueWithURLsMadeAbsolute()
 {
     RefPtrWillBeRawPtr<CSSImageSetValue> value = CSSImageSetValue::create();
     for (auto& item : *this)
         item->isImageValue() ? value->append(toCSSImageValue(*item).valueWithURLMadeAbsolute()) : value->append(item);
     return value.release();
 }
 
+void CSSImageSetValue::purgeMemory()
+{
+    size_t length = this->length();
+    for (size_t i = 0; i < length; i ++) {
+        CSSValue* value = item(i);
+        if (value && value->isImageValue())
+            toCSSImageValue(value)->purgeMemory();
+    }
+    m_imagesInSet.clear();
+    m_cachedImage = nullptr;
+}
 
 } // namespace blink