Merge from Chromium at DEPS revision 240154

This commit was generated by merge_to_master.py.

Change-Id: Idca0efe87ed6b721349fbeab55bfdc919cc4941d
diff --git a/Source/core/css/CSSFilterRule.cpp b/Source/core/css/CSSFilterRule.cpp
index c72a16e..dc44874 100644
--- a/Source/core/css/CSSFilterRule.cpp
+++ b/Source/core/css/CSSFilterRule.cpp
@@ -77,8 +77,7 @@
 void CSSFilterRule::reattach(StyleRuleBase* rule)
 {
     ASSERT(rule);
-    ASSERT_WITH_SECURITY_IMPLICATION(rule->isFilterRule());
-    m_filterRule = static_cast<StyleRuleFilter*>(rule);
+    m_filterRule = toStyleRuleFilter(rule);
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->reattach(m_filterRule->mutableProperties());
 }