DRProxyDelegate should source it's proxy config from configurator

components/data_reduction_proxy/core/browser/data_reduction_proxy_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_delegate.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 68 matching lines @@
   DCHECK(thread_checker_.CalledOnValidThread());
 
   ResourceTypeProvider::ContentType content_type =
       ResourceTypeProvider::CONTENT_TYPE_UNKNOWN;
 
   if (io_data_ && io_data_->resource_type_provider()) {
     content_type = io_data_->resource_type_provider()->GetContentType(url);
   }
 
   std::vector<DataReductionProxyServer> proxies_for_http =
-      config_->GetProxiesForHttp();
+      params::IsIncludedInHoldbackFieldTrial()
+          ? std::vector<DataReductionProxyServer>()
+          : config_->GetProxiesForHttp();
 
   // Remove the proxies that are unsupported for this request.
   proxies_for_http.erase(
       std::remove_if(proxies_for_http.begin(), proxies_for_http.end(),
                      [content_type](const DataReductionProxyServer& proxy) {
                        return !proxy.SupportsResourceType(content_type);
                      }),
       proxies_for_http.end());
 
   net::ProxyConfig proxy_config = configurator_->CreateProxyConfig(
@@ skipping 176 matching lines @@
   if (data_reduction_proxy_config.enabled_by_user_and_reachable() &&
       url.SchemeIs(url::kHttpScheme) && !net::IsLocalhost(url.host_piece()) &&
       !params::IsIncludedInHoldbackFieldTrial()) {
     UMA_HISTOGRAM_BOOLEAN(
         "DataReductionProxy.ConfigService.HTTPRequests",
         !data_reduction_proxy_config.GetProxiesForHttp().empty());
   }
 }
 
 }  // namespace data_reduction_proxy