Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/src/google/protobuf/util/internal/object_source.h

-// 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_OBJECT_SOURCE_H__
-#define GOOGLE_PROTOBUF_UTIL_CONVERTER_OBJECT_SOURCE_H__
-
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/stringpiece.h>
-#include <google/protobuf/stubs/status.h>
-
-namespace google {
-namespace protobuf {
-namespace util {
-namespace converter {
-
-class ObjectWriter;
-
-// An ObjectSource is anything that can write to an ObjectWriter.
-// Implementation of this interface typically provide constructors or
-// factory methods to create an instance based on some source data, for
-// example, a character stream, or protobuf.
-//
-// Derived classes could be thread-unsafe.
-class LIBPROTOBUF_EXPORT ObjectSource {
- public:
-  virtual ~ObjectSource() {}
-
-  // Writes to the ObjectWriter
-  virtual util::Status WriteTo(ObjectWriter* ow) const {
-    return NamedWriteTo("", ow);
-  }
-
-  // Writes to the ObjectWriter with a custom name for the message.
-  // This is useful when you chain ObjectSource together by embedding one
-  // within another.
-  virtual util::Status NamedWriteTo(StringPiece name,
-                                      ObjectWriter* ow) const = 0;
-
- protected:
-  ObjectSource() {}
-
- private:
-  // Do not add any data members to this class.
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ObjectSource);
-};
-
-}  // namespace converter
-}  // namespace util
-}  // namespace protobuf
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_UTIL_CONVERTER_OBJECT_SOURCE_H__