Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

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..fdd97ddf741a02f90b357ed3e97e23bceaa0871b
--- /dev/null
+++ b/third_party/protobuf/csharp/src/Google.Protobuf/Google.Protobuf.csproj
@@ -0,0 +1,168 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+    <AssemblyName>Google.Protobuf</AssemblyName>
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+    <AssemblyOriginatorKeyFile>..\..\keys\Google.Protobuf.snk</AssemblyOriginatorKeyFile>
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+    <Reference Include="System.Xml" />
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+       Other similar extension points exist, see Microsoft.Common.targets.
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