Fix auto raw pointer deduction on linux

net/http/http_response_headers_unittest.cc

Index: net/http/http_response_headers_unittest.cc
diff --git a/net/http/http_response_headers_unittest.cc b/net/http/http_response_headers_unittest.cc
index 0c960afcbca35bbd52bab09892a51005ed30fafc..3e0c2511851b2e9f382cc4b9995619028bd15c71 100644
--- a/net/http/http_response_headers_unittest.cc
+++ b/net/http/http_response_headers_unittest.cc
@@ -1819,7 +1819,7 @@ TEST_P(RemoveHeadersTest, RemoveHeaders) {
       new HttpResponseHeaders(orig_headers));
 
   std::unordered_set<std::string> to_remove;
-  for (const auto& header : test.to_remove) {
+  for (auto* header : test.to_remove) {
     if (header)
       to_remove.insert(header);
   }