Update //third_party/protobuf to version 3.

third_party/protobuf/csharp/src/Google.Protobuf/Google.Protobuf.csproj

Index: third_party/protobuf/csharp/src/Google.Protobuf/Google.Protobuf.csproj
diff --git a/third_party/protobuf/csharp/src/Google.Protobuf/Google.Protobuf.csproj b/third_party/protobuf/csharp/src/Google.Protobuf/Google.Protobuf.csproj
new file mode 100644
index 0000000000000000000000000000000000000000..e6af2483468632faf689a77e54dbd0e45667e690
--- /dev/null
+++ b/third_party/protobuf/csharp/src/Google.Protobuf/Google.Protobuf.csproj
@@ -0,0 +1,165 @@
+<?xml version="1.0" encoding="utf-8"?>
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+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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+    <AssemblyName>Google.Protobuf</AssemblyName>
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+    <AssemblyOriginatorKeyFile>C:\keys\Google.Protobuf.snk</AssemblyOriginatorKeyFile>
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+    <Reference Include="System" />
+    <Reference Include="System.Xml" />
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+    <Compile Include="InvalidProtocolBufferException.cs" />
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+    <Compile Include="MessageParser.cs" />
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+  <Target Name="AfterBuild">
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