Pull new version of protobuf sources.

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

Index: third_party/protobuf/csharp/src/Google.Protobuf/Reflection/MapFieldAccessor.cs
diff --git a/third_party/protobuf/python/google/protobuf/internal/more_extensions.proto b/third_party/protobuf/csharp/src/Google.Protobuf/Reflection/MapFieldAccessor.cs
similarity index 63%
copy from third_party/protobuf/python/google/protobuf/internal/more_extensions.proto
copy to third_party/protobuf/csharp/src/Google.Protobuf/Reflection/MapFieldAccessor.cs
index e2d97010450d32f2d1dd7b3ec0d2d05bf93435cb..9ed7f8c4df4c1ca7b374378c0cf8040e95f22619 100644
--- a/third_party/protobuf/python/google/protobuf/internal/more_extensions.proto
+++ b/third_party/protobuf/csharp/src/Google.Protobuf/Reflection/MapFieldAccessor.cs
@@ -1,6 +1,7 @@
+#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/
+// Copyright 2015 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
@@ -27,32 +28,32 @@
 // 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.
-
-// Author: robinson@google.com (Will Robinson)
-
-
-package google.protobuf.internal;
-
-
-message TopLevelMessage {
-  optional ExtendedMessage submessage = 1;
-}
-
-
-message ExtendedMessage {
-  extensions 1 to max;
-}
-
-
-message ForeignMessage {
-  optional int32 foreign_message_int = 1;
-}
-
-
-extend ExtendedMessage {
-  optional int32 optional_int_extension = 1;
-  optional ForeignMessage optional_message_extension = 2;
-
-  repeated int32 repeated_int_extension = 3;
-  repeated ForeignMessage repeated_message_extension = 4;
+#endregion
+
+using System;
+using System.Collections;
+using System.Reflection;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Accessor for map fields.
+    /// </summary>
+    internal sealed class MapFieldAccessor : FieldAccessorBase
+    {
+        internal MapFieldAccessor(PropertyInfo property, FieldDescriptor descriptor) : base(property, descriptor)
+        {
+        }
+
+        public override void Clear(IMessage message)
+        {
+            IDictionary list = (IDictionary) GetValue(message);
+            list.Clear();
+        }
+
+        public override void SetValue(IMessage message, object value)
+        {
+            throw new InvalidOperationException("SetValue is not implemented for map fields");
+        }
+    }
 }