Bypass DRP if a redirect cycle is detected

components/data_reduction_proxy/core/browser/data_reduction_proxy_tamper_detection.cc

 // Copyright 2014 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 "components/data_reduction_proxy/core/browser/data_reduction_proxy_tamper_detection.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 281 matching lines @@
       carrier_id_);
 }
 
 // Checks whether there are other proxies/middleboxes' named after the Data
 // Reduction Proxy's name in Via header. |has_chrome_proxy_via_header| marks
 // that whether the Data Reduction Proxy's Via header occurs or not.
 bool DataReductionProxyTamperDetection::ValidateViaHeader(
     base::StringPiece fingerprint,
     bool* has_chrome_proxy_via_header) const {
   bool has_intermediary;
-  *has_chrome_proxy_via_header = HasDataReductionProxyViaHeader(
-      response_headers_,
-      &has_intermediary);
+  *has_chrome_proxy_via_header =
+      HasDataReductionProxyViaHeader(*response_headers_, &has_intermediary);
 
   if (*has_chrome_proxy_via_header)
     return !has_intermediary;
   return true;
 }
 
 void DataReductionProxyTamperDetection::ReportUMAForViaHeaderValidation(
     bool has_chrome_proxy) const {
   // The Via header of the Data Reduction Proxy is missing.
   if (!has_chrome_proxy) {
@@ skipping 238 matching lines @@
   std::vector<std::string> values;
   std::string value;
   size_t iter = 0;
   while (headers->EnumerateHeader(&iter, header_name, &value)) {
     values.push_back(std::move(value));
   }
   return values;
 }
 
 }  // namespace data_reduction_proxy