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diff --git a/chromium/third_party/blink/renderer/core/svg/svg_external_document_cache.h b/chromium/third_party/blink/renderer/core/svg/svg_external_document_cache.h
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+/*
+    Copyright (C) 2010 Rob Buis <rwlbuis@gmail.com>
+    Copyright (C) 2011 Cosmin Truta <ctruta@gmail.com>
+    Copyright (C) 2012 University of Szeged
+    Copyright (C) 2012 Renata Hodovan <reni@webkit.org>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_SVG_SVG_EXTERNAL_DOCUMENT_CACHE_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_SVG_SVG_EXTERNAL_DOCUMENT_CACHE_H_
+
+#include "services/network/public/mojom/content_security_policy.mojom-blink.h"
+#include "third_party/blink/renderer/core/core_export.h"
+#include "third_party/blink/renderer/platform/heap/handle.h"
+#include "third_party/blink/renderer/platform/loader/fetch/resource.h"
+#include "third_party/blink/renderer/platform/loader/fetch/resource_client.h"
+#include "third_party/blink/renderer/platform/supplementable.h"
+
+namespace blink {
+class Document;
+
+class CORE_EXPORT SVGExternalDocumentCache
+    : public GarbageCollected<SVGExternalDocumentCache>,
+      public Supplement<Document> {
+  USING_GARBAGE_COLLECTED_MIXIN(SVGExternalDocumentCache);
+
+ public:
+  static const char kSupplementName[];
+  static SVGExternalDocumentCache* From(Document&);
+  explicit SVGExternalDocumentCache(Document&);
+  void Trace(Visitor*) override;
+
+  class Client : public GarbageCollectedMixin {
+   public:
+    virtual void NotifyFinished(Document*) = 0;
+  };
+
+  class CORE_EXPORT Entry final : public GarbageCollected<Entry>,
+                                  public ResourceClient {
+    USING_GARBAGE_COLLECTED_MIXIN(Entry);
+
+   public:
+    explicit Entry(Document* context_document)
+        : context_document_(context_document) {}
+    ~Entry() override = default;
+    void Trace(Visitor*) override;
+    Document* GetDocument();
+    const KURL& Url() const { return GetResource()->Url(); }
+
+   private:
+    friend class SVGExternalDocumentCache;
+    void AddClient(Client*);
+
+    // ResourceClient overrides;
+    void NotifyFinished(Resource*) override;
+    String DebugName() const override { return "SVGExternalDocumentCache"; }
+
+    Member<Document> document_;
+    Member<Document> context_document_;
+    HeapHashSet<WeakMember<Client>> clients_;
+  };
+
+  Entry* Get(Client*,
+             const KURL&,
+             const AtomicString& initiator_name,
+             network::mojom::blink::CSPDisposition =
+                 network::mojom::blink::CSPDisposition::CHECK);
+
+ private:
+  HeapHashMap<WeakMember<Resource>, WeakMember<Entry>> entries_;
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_SVG_SVG_EXTERNAL_DOCUMENT_CACHE_H_