Update //third_party/protobuf to version 3.

third_party/protobuf/csharp/src/Google.Protobuf/Reflection/IFieldAccessor.cs

+#region Copyright notice and license
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// 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.
+#endregion
 
-// Author: jasonh@google.com (Jason Hsueh)
-//
-// Implements methods of coded_stream.h that need to be inlined for performance
-// reasons, but should not be defined in a public header.
+using System;
+using System.Collections;
 
-#ifndef GOOGLE_PROTOBUF_IO_CODED_STREAM_INL_H__
-#define GOOGLE_PROTOBUF_IO_CODED_STREAM_INL_H__
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Allows fields to be reflectively accessed.
+    /// </summary>
+    public interface IFieldAccessor
+    {
+        /// <summary>
+        /// Returns the descriptor associated with this field.
+        /// </summary>
+        FieldDescriptor Descriptor { get; }
 
-#include <google/protobuf/io/coded_stream.h>
-#include <string>
-#include <google/protobuf/stubs/stl_util.h>
+        /// <summary>
+        /// Clears the field in the specified message. (For repeated fields,
+        /// this clears the list.)
+        /// </summary>
+        void Clear(IMessage message);
 
-namespace google {
-namespace protobuf {
-namespace io {
+        /// <summary>
+        /// Fetches the field value. For repeated values, this will be an
+        /// <see cref="IList"/> implementation. For map values, this will be an
+        /// <see cref="IDictionary"/> implementation.
+        /// </summary>
+        object GetValue(IMessage message);
 
-inline bool CodedInputStream::InternalReadStringInline(string* buffer,
-                                                       int size) {
-  if (size < 0) return false;  // security: size is often user-supplied
-
-  if (BufferSize() >= size) {
-    STLStringResizeUninitialized(buffer, size);
-    // When buffer is empty, string_as_array(buffer) will return NULL but memcpy
-    // requires non-NULL pointers even when size is 0. Hench this check.
-    if (size > 0) {
-      memcpy(string_as_array(buffer), buffer_, size);
-      Advance(size);
+        /// <summary>
+        /// Mutator for single "simple" fields only.
+        /// </summary>
+        /// <remarks>
+        /// Repeated fields are mutated by fetching the value and manipulating it as a list.
+        /// Map fields are mutated by fetching the value and manipulating it as a dictionary.
+        /// </remarks>
+        /// <exception cref="InvalidOperationException">The field is not a "simple" field.</exception>
+        void SetValue(IMessage message, object value);
     }
-    return true;
-  }
-
-  return ReadStringFallback(buffer, size);
-}
-
-}  // namespace io
-}  // namespace protobuf
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_IO_CODED_STREAM_INL_H__
+}