Update third_party/protobuf to protobuf-v3.0.0-beta-3

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

-#region Copyright notice and license
+#region Copyright notice and license
 // 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.
@@ skipping 11 matching lines @@
 // 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
 
+using System;
+
 namespace Google.Protobuf.Reflection
 {
     /// <summary>
-    /// Interface implemented by all descriptor types.
+    /// Specifies the original name (in the .proto file) of a named element,
+    /// such as an enum value.
     /// </summary>
-    public interface IDescriptor
+    [AttributeUsage(AttributeTargets.Field)]
+    public class OriginalNameAttribute : Attribute
     {
         /// <summary>
-        /// Returns the name of the entity (message, field etc) being described.
+        /// The name of the element in the .proto file.
         /// </summary>
-        string Name { get; }
+        public string Name { get; set; }
 
         /// <summary>
-        /// Returns the fully-qualified name of the entity being described.
+        /// Constructs a new attribute instance for the given name.
         /// </summary>
-        string FullName { get; }
-
-        /// <summary>
-        /// Returns the descriptor for the .proto file that this entity is part of.
-        /// </summary>
-        FileDescriptor File { get; }
-    }    
+        /// <param name="name">The name of the element in the .proto file.</param>
+        public OriginalNameAttribute(string name)
+        {
+            Name = ProtoPreconditions.CheckNotNull(name, nameof(name));
+        }
+    }
 }