DRProxyDelegate should source it's proxy config from configurator

components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.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_network_delegate.h"
 
 #include <algorithm>
 #include <limits>
 #include <utility>
 
@@ skipping 268 matching lines @@
   base::Optional<uint64_t> page_id;
   if (data && data->session_key() ==
                   data_reduction_proxy_request_options_->GetSecureSession()) {
     page_id = data->page_id();
   }
 
   // Reset |request|'s DataReductionProxyData.
   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;
   // The following checks rule out direct, invalid, and other connection types.
   if (!proxy_info.is_http() && !proxy_info.is_https() &&
       !proxy_info.is_quic()) {
     using_data_reduction_proxy = false;
   } else if (proxy_info.proxy_server().host_port_pair().IsEmpty()) {
     using_data_reduction_proxy = false;
   } else if (!data_reduction_proxy_config_->IsDataReductionProxy(
@@ skipping 383 matching lines @@
 }
 
 void DataReductionProxyNetworkDelegate::RemoveChromeProxyECTHeader(
     net::HttpRequestHeaders* request_headers) const {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   request_headers->RemoveHeader(chrome_proxy_ect_header());
 }
 
 }  // namespace data_reduction_proxy