Added support for 'Chrome-Proxy: block-once' header

components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc
index 4713a815aab9b005639c6475e33232651ff3565c..6c4fc8723ecc5d493757cc1d662c4aacf7ebfe49 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc
@@ -90,10 +90,12 @@ bool MaybeBypassProxyAndPrepareToRetry(
         bypass_type);
   }
 
-  MarkProxiesAsBadUntil(request,
-                        data_reduction_proxy_info.bypass_duration,
-                        data_reduction_proxy_info.bypass_all,
-                        data_reduction_proxy_type_info.proxy_servers);
+  if (data_reduction_proxy_info.mark_proxies_as_bad) {
+    MarkProxiesAsBadUntil(request,
+                          data_reduction_proxy_info.bypass_duration,
+                          data_reduction_proxy_info.bypass_all,
+                          data_reduction_proxy_type_info.proxy_servers);
+  }
 
   // Only retry idempotent methods.
   if (!IsRequestIdempotent(request))