Revert of Tracking filter mutation via SVGElementProxy

third_party/WebKit/Source/core/fetch/DocumentResourceReference.h

Index: third_party/WebKit/Source/core/fetch/DocumentResourceReference.h
diff --git a/third_party/WebKit/Source/core/fetch/DocumentResourceReference.h b/third_party/WebKit/Source/core/fetch/DocumentResourceReference.h
new file mode 100644
index 0000000000000000000000000000000000000000..f606fef1fe210aca4b3454bf75d346b28f5e7254
--- /dev/null
+++ b/third_party/WebKit/Source/core/fetch/DocumentResourceReference.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2012 Google 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
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DocumentResourceReference_h
+#define DocumentResourceReference_h
+
+#include "core/fetch/DocumentResource.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class DocumentResourceReference final
+    : public GarbageCollectedFinalized<DocumentResourceReference>,
+      public DocumentResourceClient {
+  USING_GARBAGE_COLLECTED_MIXIN(DocumentResourceReference);
+  USING_PRE_FINALIZER(DocumentResourceReference, removeSelf);
+
+ public:
+  explicit DocumentResourceReference(DocumentResource* document)
+      : m_document(document) {
+    ThreadState::current()->registerPreFinalizer(this);
+    m_document->addClient(this);
+  }
+  ~DocumentResourceReference() override {}
+  DocumentResource* document() { return m_document.get(); }
+  DEFINE_INLINE_TRACE() {
+    visitor->trace(m_document);
+    DocumentResourceClient::trace(visitor);
+  }
+
+ private:
+  void removeSelf() { m_document->removeClient(this); }
+
+  String debugName() const override { return "DocumentResourceReference"; }
+  Member<DocumentResource> m_document;
+};
+
+}  // namespace blink
+
+#endif