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diff --git a/src/google/protobuf/util/internal/structured_objectwriter.h b/src/google/protobuf/util/internal/structured_objectwriter.h
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--- a/src/google/protobuf/util/internal/structured_objectwriter.h
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@@ -1,118 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * 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.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
-// OWNER OR 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 GOOGLE_PROTOBUF_UTIL_CONVERTER_STRUCTURED_OBJECTWRITER_H__
-#define GOOGLE_PROTOBUF_UTIL_CONVERTER_STRUCTURED_OBJECTWRITER_H__
-
-#include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
-
-#include <google/protobuf/stubs/casts.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/util/internal/object_writer.h>
-
-namespace google {
-namespace protobuf {
-namespace util {
-namespace converter {
-
-// An StructuredObjectWriter is an ObjectWriter for writing
-// tree-structured data in a stream of events representing objects
-// and collections. Implementation of this interface can be used to
-// write an object stream to an in-memory structure, protobufs,
-// JSON, XML, or any other output format desired. The ObjectSource
-// interface is typically used as the source of an object stream.
-//
-// See JsonObjectWriter for a sample implementation of
-// StructuredObjectWriter and its use.
-//
-// Derived classes could be thread-unsafe.
-class LIBPROTOBUF_EXPORT StructuredObjectWriter : public ObjectWriter {
- public:
-  virtual ~StructuredObjectWriter() {}
-
- protected:
-  // A base element class for subclasses to extend, makes tracking state easier.
-  //
-  // StructuredObjectWriter behaves as a visitor. BaseElement represents a node
-  // in the input tree. Implementation of StructuredObjectWriter should also
-  // extend BaseElement to keep track of the location in the input tree.
-  class LIBPROTOBUF_EXPORT BaseElement {
-   public:
-    // Takes ownership of the parent Element.
-    explicit BaseElement(BaseElement* parent)
-        : parent_(parent), level_(parent == NULL ? 0 : parent->level() + 1) {}
-    virtual ~BaseElement() {}
-
-    // Releases ownership of the parent and returns a pointer to it.
-    template <typename ElementType>
-    ElementType* pop() {
-      return down_cast<ElementType*>(parent_.release());
-    }
-
-    // Returns true if this element is the root.
-    bool is_root() const { return parent_ == NULL; }
-
-    // Returns the number of hops from this element to the root element.
-    int level() const { return level_; }
-
-   protected:
-    // Returns pointer to parent element without releasing ownership.
-    virtual BaseElement* parent() const { return parent_.get(); }
-
-   private:
-    // Pointer to the parent Element.
-    google::protobuf::scoped_ptr<BaseElement> parent_;
-
-    // Number of hops to the root Element.
-    // The root Element has NULL parent_ and a level_ of 0.
-    const int level_;
-
-    GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS(BaseElement);
-  };
-
-  StructuredObjectWriter() {}
-
-  // Returns the current element. Used for indentation and name overrides.
-  virtual BaseElement* element() = 0;
-
- private:
-  // Do not add any data members to this class.
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(StructuredObjectWriter);
-};
-
-}  // namespace converter
-}  // namespace util
-}  // namespace protobuf
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_UTIL_CONVERTER_STRUCTURED_OBJECTWRITER_H__