Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_source_generator_base.cc

Index: third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_source_generator_base.cc
diff --git a/third_party/protobuf/src/google/protobuf/io/zero_copy_stream.cc b/third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_source_generator_base.cc
similarity index 63%
copy from third_party/protobuf/src/google/protobuf/io/zero_copy_stream.cc
copy to third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_source_generator_base.cc
index dad6ff14468d031f16baafb2f1ca567961251c43..735d164a48f3157513c5f92f4f10cf5dc772ca67 100644
--- a/third_party/protobuf/src/google/protobuf/io/zero_copy_stream.cc
+++ b/third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_source_generator_base.cc
@@ -1,6 +1,6 @@
 // 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
@@ -28,21 +28,39 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
+#include <sstream>
 
+#include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/compiler/plugin.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/printer.h>
 #include <google/protobuf/io/zero_copy_stream.h>
 
+#include <google/protobuf/compiler/csharp/csharp_source_generator_base.h>
+#include <google/protobuf/compiler/csharp/csharp_helpers.h>
 
 namespace google {
 namespace protobuf {
-namespace io {
+namespace compiler {
+namespace csharp {
 
-ZeroCopyInputStream::~ZeroCopyInputStream() {}
-ZeroCopyOutputStream::~ZeroCopyOutputStream() {}
+SourceGeneratorBase::SourceGeneratorBase(const FileDescriptor* descriptor)
+    : descriptor_(descriptor) {
+}
 
+SourceGeneratorBase::~SourceGeneratorBase() {
+}
 
-}  // namespace io
+void SourceGeneratorBase::WriteGeneratedCodeAttributes(io::Printer* printer) {
+  // This hook can be used to reintroduce generated code attributes in the future.
+}
+
+std::string SourceGeneratorBase::class_access_level() {
+  return IsDescriptorProto(descriptor_) ? "internal" : "public";  // public_classes is always on.
+}
+
+}  // namespace csharp
+}  // namespace compiler
 }  // namespace protobuf
 }  // namespace google