Use an SVGElementProxy in ReferenceClipPathOperation

third_party/WebKit/Source/core/svg/SVGElementProxy.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/svg/SVGElementProxy.h"
 
 #include "core/dom/IdTargetObserver.h"
 #include "core/fetch/FetchInitiatorTypeNames.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/svg/SVGElement.h"
-#include "core/svg/SVGFilterElement.h"
 #include "core/svg/SVGResourceClient.h"
 
 namespace blink {
 
 class SVGElementProxy::IdObserver : public IdTargetObserver {
  public:
   IdObserver(TreeScope& treeScope, SVGElementProxy& proxy)
       : IdTargetObserver(treeScope.idTargetObserverRegistry(), proxy.id()),
         m_treeScope(&treeScope) {}
 
@@ skipping 127 matching lines @@
 }
 
 SVGElement* SVGElementProxy::findElement(TreeScope& treeScope) {
   // An empty id will never be a valid element reference.
   if (m_id.isEmpty())
     return nullptr;
   TreeScope* lookupScope = treeScopeForLookup(treeScope);
   if (!lookupScope)
     return nullptr;
   if (Element* targetElement = lookupScope->getElementById(m_id)) {
-    if (isSVGFilterElement(*targetElement)) {
-      toSVGFilterElement(*targetElement).elementProxySet().add(*this);
+    SVGElementProxySet* proxySet =
+        targetElement->isSVGElement()
+            ? toSVGElement(targetElement)->elementProxySet()
+            : nullptr;
+    if (proxySet) {
+      proxySet->add(*this);
       return toSVGElement(targetElement);
     }
   }
   return nullptr;
 }
 
 void SVGElementProxy::contentChanged(TreeScope& treeScope) {
   if (auto* observer = m_observers.get(&treeScope))
     observer->contentChanged();
 }
@@ skipping 15 matching lines @@
 void SVGElementProxySet::notifyContentChanged(TreeScope& treeScope) {
   for (SVGElementProxy* proxy : m_elementProxies)
     proxy->contentChanged(treeScope);
 }
 
 DEFINE_TRACE(SVGElementProxySet) {
   visitor->trace(m_elementProxies);
 }
 
 }  // namespace blink