Revert of Modify data_reduction_proxy_header to support tamper detection logic.

chrome/browser/android/intercept_download_resource_throttle.cc

Index: chrome/browser/android/intercept_download_resource_throttle.cc
diff --git a/chrome/browser/android/intercept_download_resource_throttle.cc b/chrome/browser/android/intercept_download_resource_throttle.cc
index 721ed3d9b6859ccbb397e059c8aff33ed4e9fb1d..1101b1e9ebe211f02312e6dee8bb98c658552f65 100644
--- a/chrome/browser/android/intercept_download_resource_throttle.cc
+++ b/chrome/browser/android/intercept_download_resource_throttle.cc
@@ -62,7 +62,7 @@
     if (headers.HasHeader(net::HttpRequestHeaders::kAuthorization) ||
         !(request_->response_info().headers &&
             data_reduction_proxy::HasDataReductionProxyViaHeader(
-                request_->response_info().headers, NULL))) {
+                request_->response_info().headers))) {
       return;
     }
 #else