Revert "third_party/protobuf: Update to HEAD (83d681ee2c)"

third_party/protobuf/src/google/protobuf/stubs/strutil.h

Index: third_party/protobuf/src/google/protobuf/stubs/strutil.h
diff --git a/third_party/protobuf/src/google/protobuf/stubs/strutil.h b/third_party/protobuf/src/google/protobuf/stubs/strutil.h
index df28c94da8c3b853f03acdf346d762ebffd7ad2a..8bdd611030ff4bc6ef95bc2855ae6727a94b2400 100644
--- a/third_party/protobuf/src/google/protobuf/stubs/strutil.h
+++ b/third_party/protobuf/src/google/protobuf/stubs/strutil.h
@@ -147,7 +147,7 @@ inline string StripSuffixString(const string& str, const string& suffix) {
 }
 
 // ----------------------------------------------------------------------
-// ReplaceCharacters
+// StripString
 //    Replaces any occurrence of the character 'remove' (or the characters
 //    in 'remove') with the character 'replacewith'.
 //    Good for keeping html characters or protocol characters (\t) out
@@ -155,8 +155,6 @@ inline string StripSuffixString(const string& str, const string& suffix) {
 // StripWhitespace
 //    Removes whitespaces from both ends of the given string.
 // ----------------------------------------------------------------------
-LIBPROTOBUF_EXPORT void ReplaceCharacters(string* s, const char* remove,
-                                          char replacewith);
 LIBPROTOBUF_EXPORT void StripString(string* s, const char* remove,
                                     char replacewith);