Update //third_party/protobuf to version 3.

third_party/protobuf/csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs

Index: third_party/protobuf/csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs
diff --git a/third_party/protobuf/csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs b/third_party/protobuf/csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000000000000000000000000000000000000..d00acf8554eafd6a0e8fc308d5fc060f2d1a29cf
--- /dev/null
+++ b/third_party/protobuf/csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+
+[assembly: AssemblyTitle("Google.Protobuf.Test")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Google.Protobuf.Test")]
+[assembly: AssemblyCopyright("Copyright ©  2015")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+[assembly: AssemblyVersion("3.0.0.0")]
+[assembly: AssemblyFileVersion("3.0.0.0")]