DRProxyDelegate should source it's proxy config from configurator

components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
index 7a5f5dcc40fba7fac27a9805e25324372f900f4d..be15b7fba97c742aaae996380386c04e8cea67b5 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
@@ -286,16 +286,12 @@ void DataReductionProxyNetworkDelegate::OnBeforeSendHeadersInternal(
   DataReductionProxyData::ClearData(request);
 
   if (params::IsIncludedInHoldbackFieldTrial()) {
-    if (!WasEligibleWithoutHoldback(*request, proxy_info, proxy_retry_info))
-      return;
-    // For the holdback field trial, still log UMA as if the proxy was used.
-    data = DataReductionProxyData::GetDataAndCreateIfNecessary(request);
-    if (data)
-      data->set_used_data_reduction_proxy(true);
-
-    headers->RemoveHeader(chrome_proxy_header());
-    VerifyHttpRequestHeaders(false, *headers);
-    return;
+    if (WasEligibleWithoutHoldback(*request, proxy_info, proxy_retry_info)) {
+      // For the holdback field trial, still log UMA as if the proxy was used.
+      data = DataReductionProxyData::GetDataAndCreateIfNecessary(request);
+      if (data)
+        data->set_used_data_reduction_proxy(true);
+    }
   }
 
   bool using_data_reduction_proxy = true;