Update a TODO to point to the relevant bug.

net/http/http_util.h

Index: net/http/http_util.h
diff --git a/net/http/http_util.h b/net/http/http_util.h
index fe68423f6085473cd8af01f4bcbae363c063d308..a0ee9bba79dfab0d366268deb740233e83f4e555 100644
--- a/net/http/http_util.h
+++ b/net/http/http_util.h
@@ -201,10 +201,8 @@ class NET_EXPORT HttpUtil {
   // is a workaround to avoid later code from incorrectly interpreting it as
   // a line terminator.
   //
-  // TODO(eroman): we should use \n as the canonical line separator rather than
-  //               \0 to avoid this problem. Unfortunately the persistence layer
-  //               is already dependent on newlines being replaced by NULL so
-  //               this is hard to change without breaking things.
+  // TODO(crbug.com/671799): Should remove or internalize this to
+  //                         HttpResponseHeaders.
   static std::string AssembleRawHeaders(const char* buf, int buf_len);
 
   // Converts assembled "raw headers" back to the HTTP response format. That is