Fix auto raw pointer deduction on linux

net/http/http_response_headers_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_response_headers.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <iostream>
@@ skipping 1801 matching lines @@
 
 TEST_P(RemoveHeadersTest, RemoveHeaders) {
   const RemoveHeadersTestData test = GetParam();
 
   std::string orig_headers(test.orig_headers);
   HeadersToRaw(&orig_headers);
   scoped_refptr<HttpResponseHeaders> parsed(
       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);
   }
   parsed->RemoveHeaders(to_remove);
 
   EXPECT_EQ(std::string(test.expected_headers), ToSimpleString(parsed));
 }
 
 const RemoveHeadersTestData remove_headers_tests[] = {
     {"HTTP/1.1 200 OK\n"
@@ skipping 449 matching lines @@
      "Fri, 20 Jan 2011 10:40:08 GMT", "Fri, 20 Jan 2011 10:40:12 GMT",
      "Fri, 20 Jan 2011 10:40:14 GMT", 7}};
 
 INSTANTIATE_TEST_CASE_P(HttpResponseHeaders,
                         GetCurrentAgeTest,
                         testing::ValuesIn(get_current_age_tests));
 
 }  // namespace
 
 }  // namespace net