Modify data_reduction_proxy_header to support tamper detection logic.

components/data_reduction_proxy/browser/data_reduction_proxy_metrics.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/browser/data_reduction_proxy_metrics.h"
 
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 338 matching lines @@
   if (!request->url().SchemeIs("http")) {
     NOTREACHED();
     return UNKNOWN_TYPE;
   }
   int64 bypass_delay = 0;
   if (IsBypassRequest(request, &bypass_delay)) {
     return (bypass_delay > kLongBypassDelayInSeconds) ?
       LONG_BYPASS : SHORT_BYPASS;
   }
   if (request->response_info().headers &&
-      HasDataReductionProxyViaHeader(request->response_info().headers)) {
+      HasDataReductionProxyViaHeader(request->response_info().headers, NULL)) {
     return VIA_DATA_REDUCTION_PROXY;
   }
   return UNKNOWN_TYPE;
 }
 
 int64 GetAdjustedOriginalContentLength(
     DataReductionProxyRequestType request_type,
     int64 original_content_length,
     int64 received_content_length) {
   // Since there was no indication of the original content length, presume
@@ skipping 164 matching lines @@
   UpdateContentLengthPrefsForDataReductionProxy(
       received_content_length,
       original_content_length,
       with_data_reduction_proxy_enabled,
       request_type,
       base::Time::Now(),
       prefs);
 }
 
 }  // namespace data_reduction_proxy