Ensure HttpResponseHeaders::raw_headers_ always ends with 2 '\0' characters.

net/http/http_response_headers.h

Index: net/http/http_response_headers.h
diff --git a/net/http/http_response_headers.h b/net/http/http_response_headers.h
index e33138979e9c5b6a0f46bd664bb9517cc6f760fe..c4636a66b007d516f72c55a38bd2de367e7b0f49 100644
--- a/net/http/http_response_headers.h
+++ b/net/http/http_response_headers.h
@@ -278,7 +278,7 @@ class NET_EXPORT HttpResponseHeaders
   // construct a valid one.  Example input:
   //    HTTP/1.1 200 OK
   // with line_begin and end pointing at the begin and end of this line.
-  // Output will be a normalized version of this, with a trailing \n.
+  // Output will be a normalized version of this.
   void ParseStatusLine(std::string::const_iterator line_begin,
                        std::string::const_iterator line_end,
                        bool has_headers);