third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/csharp/src/AddressBook/AddressBook.xproj

Index: third_party/protobuf/csharp/src/AddressBook/AddressBook.xproj
diff --git a/third_party/protobuf/csharp/src/AddressBook/AddressBook.xproj b/third_party/protobuf/csharp/src/AddressBook/AddressBook.xproj
new file mode 100644
index 0000000000000000000000000000000000000000..4c9925e83d21f98e66f9fcdc8d5e4993de47816f
--- /dev/null
+++ b/third_party/protobuf/csharp/src/AddressBook/AddressBook.xproj
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>afb63919-1e05-43b4-802a-8fb8c9b2f463</ProjectGuid>
+    <RootNamespace>AddressBook</RootNamespace>
+    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
+    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
+</Project>