Revert of Tracking filter mutation via SVGElementProxy

third_party/WebKit/Source/core/style/FilterOperation.h

Index: third_party/WebKit/Source/core/style/FilterOperation.h
diff --git a/third_party/WebKit/Source/core/style/FilterOperation.h b/third_party/WebKit/Source/core/style/FilterOperation.h
index cf564f9f3524cb46233bb6d2c5a3177db66a288c..234d8bb5a7b84c1807b05955b8843562c6a548f7 100644
--- a/third_party/WebKit/Source/core/style/FilterOperation.h
+++ b/third_party/WebKit/Source/core/style/FilterOperation.h
@@ -38,8 +38,6 @@
 namespace blink {
 
 class Filter;
-class SVGResourceClient;
-class SVGElementProxy;
 
 // CSS Filters
 
@@ -130,8 +128,8 @@
 class CORE_EXPORT ReferenceFilterOperation : public FilterOperation {
  public:
   static ReferenceFilterOperation* create(const String& url,
-                                          SVGElementProxy& elementProxy) {
-    return new ReferenceFilterOperation(url, elementProxy);
+                                          const AtomicString& fragment) {
+    return new ReferenceFilterOperation(url, fragment);
   }
 
   bool affectsOpacity() const override { return true; }
@@ -139,30 +137,33 @@
   FloatRect mapRect(const FloatRect&) const override;
 
   const String& url() const { return m_url; }
+  const AtomicString& fragment() const { return m_fragment; }
 
   Filter* getFilter() const { return m_filter.get(); }
   void setFilter(Filter* filter) { m_filter = filter; }
 
-  SVGElementProxy& elementProxy() const { return *m_elementProxy; }
-
-  void addClient(SVGResourceClient*);
-  void removeClient(SVGResourceClient*);
-
   DECLARE_VIRTUAL_TRACE();
 
  private:
-  ReferenceFilterOperation(const String& url, SVGElementProxy&);
-
   FilterOperation* blend(const FilterOperation* from,
                          double progress) const override {
     NOTREACHED();
     return nullptr;
   }
 
-  bool operator==(const FilterOperation&) const override;
+  bool operator==(const FilterOperation& o) const override {
+    if (!isSameType(o))
+      return false;
+    const ReferenceFilterOperation* other =
+        static_cast<const ReferenceFilterOperation*>(&o);
+    return m_url == other->m_url;
+  }
+
+  ReferenceFilterOperation(const String& url, const AtomicString& fragment)
+      : FilterOperation(REFERENCE), m_url(url), m_fragment(fragment) {}
 
   String m_url;
-  Member<SVGElementProxy> m_elementProxy;
+  AtomicString m_fragment;
   Member<Filter> m_filter;
 };