Update //third_party/protobuf to version 3.

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

+#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.
+//     * 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
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Describes a single method in a service.
+    /// </summary>
+    public sealed class MethodDescriptor : DescriptorBase
+    {
+        private readonly MethodDescriptorProto proto;
+        private readonly ServiceDescriptor service;
+        private MessageDescriptor inputType;
+        private MessageDescriptor outputType;
+
+        /// <value>
+        /// The service this method belongs to.
+        /// </value>
+        public ServiceDescriptor Service { get { return service; } }
+
+        /// <value>
+        /// The method's input type.
+        /// </value>
+        public MessageDescriptor InputType { get { return inputType; } }
+
+        /// <value>
+        /// The method's input type.
+        /// </value>
+        public MessageDescriptor OutputType { get { return outputType; } }
+
+        /// <value>
+        /// Indicates if client streams multiple requests.
+        /// </value>
+        public bool IsClientStreaming { get { return proto.ClientStreaming; } }
+
+        /// <value>
+        /// Indicates if server streams multiple responses.
+        /// </value>
+        public bool IsServerStreaming { get { return proto.ServerStreaming; } }
+
+        internal MethodDescriptor(MethodDescriptorProto proto, FileDescriptor file,
+                                  ServiceDescriptor parent, int index)
+            : base(file, parent.FullName + "." + proto.Name, index)
+        {
+            this.proto = proto;
+            service = parent;
+            file.DescriptorPool.AddSymbol(this);
+        }
+
+        internal MethodDescriptorProto Proto { get { return proto; } }
+
+        /// <summary>
+        /// The brief name of the descriptor's target.
+        /// </summary>
+        public override string Name { get { return proto.Name; } }
+
+        internal void CrossLink()
+        {
+            IDescriptor lookup = File.DescriptorPool.LookupSymbol(Proto.InputType, this);
+            if (!(lookup is MessageDescriptor))
+            {
+                throw new DescriptorValidationException(this, "\"" + Proto.InputType + "\" is not a message type.");
+            }
+            inputType = (MessageDescriptor) lookup;
+
+            lookup = File.DescriptorPool.LookupSymbol(Proto.OutputType, this);
+            if (!(lookup is MessageDescriptor))
+            {
+                throw new DescriptorValidationException(this, "\"" + Proto.OutputType + "\" is not a message type.");
+            }
+            outputType = (MessageDescriptor) lookup;
+        }
+    }
+}