third_party/protobuf: update to upstream r371

third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_file.cc

Index: third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_file.cc
diff --git a/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_file.cc b/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_file.cc
index c24ae05b19d4d47d4f7772e899dec0960d47754b..810600b34d667e90cd63f5691cec0b3f7ef20840 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_file.cc
+++ b/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_file.cc
@@ -288,6 +288,7 @@ void FileGenerator::GenerateSource(io::Printer* printer) {
   printer->Print(
     "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n"
     "\n"
+
     // The generated code calls accessors that might be deprecated. We don't
     // want the compiler to warn in generated code.
     "#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION\n"
@@ -545,7 +546,7 @@ void FileGenerator::GenerateBuildDescriptors(io::Printer* printer) {
     static const int kBytesPerLine = 40;
     for (int i = 0; i < file_data.size(); i += kBytesPerLine) {
       printer->Print("\n  \"$data$\"",
-        "data", CEscape(file_data.substr(i, kBytesPerLine)));
+        "data", EscapeTrigraphs(CEscape(file_data.substr(i, kBytesPerLine))));
     }
     printer->Print(
       ", $size$);\n",