New CPAT support in DataReductionProxyConfig guarded by feature flag.

components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
index 9ca7cffa89bab078e866da2d41177560a2a28647..e43da1e4496b91538334ee4effd9cb39e44f6daf 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
@@ -293,23 +293,25 @@ void DataReductionProxyIOData::SetDataReductionProxyConfiguration(
 bool DataReductionProxyIOData::ShouldEnableLoFi(
     const net::URLRequest& request,
     previews::PreviewsDecider* previews_decider) {
+  DCHECK(previews_decider);
   DCHECK((request.load_flags() & net::LOAD_MAIN_FRAME_DEPRECATED) != 0);
   if (!config_ || (config_->IsBypassedByDataReductionProxyLocalRules(
                       request, configurator_->GetProxyConfig()))) {
     return false;
   }
-  return config_->ShouldEnableLoFi(request, previews_decider);
+  return config_->ShouldEnableLoFi(request, *previews_decider);
 }
 
 bool DataReductionProxyIOData::ShouldEnableLitePages(
     const net::URLRequest& request,
     previews::PreviewsDecider* previews_decider) {
+  DCHECK(previews_decider);
   DCHECK((request.load_flags() & net::LOAD_MAIN_FRAME_DEPRECATED) != 0);
   if (!config_ || (config_->IsBypassedByDataReductionProxyLocalRules(
                       request, configurator_->GetProxyConfig()))) {
     return false;
   }
-  return config_->ShouldEnableLitePages(request, previews_decider);
+  return config_->ShouldEnableLitePages(request, *previews_decider);
 }
 
 void DataReductionProxyIOData::SetLoFiModeOff() {