Update //third_party/protobuf to version 3.

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

Index: third_party/protobuf/csharp/src/Google.Protobuf/Reflection/PackageDescriptor.cs
diff --git a/third_party/protobuf/python/google/protobuf/pyext/python_protobuf.cc b/third_party/protobuf/csharp/src/Google.Protobuf/Reflection/PackageDescriptor.cs
similarity index 60%
copy from third_party/protobuf/python/google/protobuf/pyext/python_protobuf.cc
copy to third_party/protobuf/csharp/src/Google.Protobuf/Reflection/PackageDescriptor.cs
index 1b1ab5d1dc7f4bf986884718c67d69a460232ada..e547d834986de8d80703504469e9c39b3d8ae93d 100644
--- a/third_party/protobuf/python/google/protobuf/pyext/python_protobuf.cc
+++ b/third_party/protobuf/csharp/src/Google.Protobuf/Reflection/PackageDescriptor.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/
+// 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
@@ -27,37 +28,41 @@
 // 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.
+#endregion
 
-// Author: qrczak@google.com (Marcin Kowalczyk)
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Represents a package in the symbol table.  We use PackageDescriptors
+    /// just as placeholders so that someone cannot define, say, a message type
+    /// that has the same name as an existing package.
+    /// </summary>
+    internal sealed class PackageDescriptor : IDescriptor
+    {
+        private readonly string name;
+        private readonly string fullName;
+        private readonly FileDescriptor file;
 
-#include <google/protobuf/pyext/python_protobuf.h>
+        internal PackageDescriptor(string name, string fullName, FileDescriptor file)
+        {
+            this.file = file;
+            this.fullName = fullName;
+            this.name = name;
+        }
 
-namespace google {
-namespace protobuf {
-namespace python {
+        public string Name
+        {
+            get { return name; }
+        }
 
-static const Message* GetCProtoInsidePyProtoStub(PyObject* msg) {
-  return NULL;
-}
-static Message* MutableCProtoInsidePyProtoStub(PyObject* msg) {
-  return NULL;
-}
+        public string FullName
+        {
+            get { return fullName; }
+        }
 
-// This is initialized with a default, stub implementation.
-// If python-google.protobuf.cc is loaded, the function pointer is overridden
-// with a full implementation.
-const Message* (*GetCProtoInsidePyProtoPtr)(PyObject* msg) =
-    GetCProtoInsidePyProtoStub;
-Message* (*MutableCProtoInsidePyProtoPtr)(PyObject* msg) =
-    MutableCProtoInsidePyProtoStub;
-
-const Message* GetCProtoInsidePyProto(PyObject* msg) {
-  return GetCProtoInsidePyProtoPtr(msg);
-}
-Message* MutableCProtoInsidePyProto(PyObject* msg) {
-  return MutableCProtoInsidePyProtoPtr(msg);
-}
-
-}  // namespace python
-}  // namespace protobuf
-}  // namespace google
+        public FileDescriptor File
+        {
+            get { return file; }
+        }
+    }
+}