third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment.cc

Index: third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment.cc
diff --git a/third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment.cc b/third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment.cc
index 0b5caba434ccb0f4e720f3181985d90ad3142bea..59c04ad412763ac19f6acbc524f56a2ae409ecc2 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment.cc
+++ b/third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment.cc
@@ -115,7 +115,7 @@ static void WriteDocCommentBodyForLocation(
     // HTML-escape them so that they don't accidentally close the doc comment.
     comments = EscapeJavadoc(comments);
 
-    vector<string> lines = Split(comments, "\n");
+    std::vector<string> lines = Split(comments, "\n");
     while (!lines.empty() && lines.back().empty()) {
       lines.pop_back();
     }