don't convert header names to nested values

fixes #6855

atom/browser/net/atom_network_delegate.cc

@@ -87,7 +87,7 @@ void ToDictionary(base::DictionaryValue* details,
   std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue);
   net::HttpRequestHeaders::Iterator it(headers);
   while (it.GetNext())
-    dict->SetString(it.name(), it.value());
+    dict->SetStringWithoutPathExpansion(it.name(), it.value());
   details->Set("requestHeaders", std::move(dict));
 }