third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_names.h

Index: third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_names.h
diff --git a/third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_names.h b/third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_names.h
index 308051871c1027631c3d91511016a6a78f1421b4..21758f2882c74160683f96fa328b40508aa55d35 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_names.h
+++ b/third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_names.h
@@ -39,6 +39,7 @@
 #define GOOGLE_PROTOBUF_COMPILER_CSHARP_NAMES_H__
 
 #include <string>
+#include <google/protobuf/stubs/port.h>
 
 namespace google {
 namespace protobuf {
@@ -56,14 +57,14 @@ namespace csharp {
 //
 // Returns:
 //   The namespace to use for given file descriptor.
-string GetFileNamespace(const FileDescriptor* descriptor);
+string LIBPROTOC_EXPORT GetFileNamespace(const FileDescriptor* descriptor);
 
 // Requires:
 //   descriptor != NULL
 //
 // Returns:
 //   The fully-qualified C# class name.
-string GetClassName(const Descriptor* descriptor);
+string LIBPROTOC_EXPORT GetClassName(const Descriptor* descriptor);
 
 // Requires:
 //   descriptor != NULL
@@ -72,7 +73,7 @@ string GetClassName(const Descriptor* descriptor);
 //   The fully-qualified name of the C# class that provides
 //   access to the file descriptor. Proto compiler generates
 //   such class for each .proto file processed.
-string GetReflectionClassName(const FileDescriptor* descriptor);
+string LIBPROTOC_EXPORT GetReflectionClassName(const FileDescriptor* descriptor);
 
 // Generates output file name for given file descriptor. If generate_directories
 // is true, the output file will be put under directory corresponding to file's
@@ -88,7 +89,7 @@ string GetReflectionClassName(const FileDescriptor* descriptor);
 //    The file name to use as output file for given file descriptor. In case
 //    of failure, this function will return empty string and error parameter
 //    will contain the error message.
-string GetOutputFile(
+string LIBPROTOC_EXPORT GetOutputFile(
     const google::protobuf::FileDescriptor* descriptor,
     const string file_extension,
     const bool generate_directories,