Allow data reduction proxy (DRP) warmup URL fetch to use cookies

components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
index 36a1192af49a824059651cec89938ab4687cec9f..bd710e6f027d0acdc586cdd77430a8f5b051175e 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
@@ -354,9 +354,9 @@ class WarmupURLFetcher : public net::URLFetcherDelegate {
     data_use_measurement::DataUseUserData::AttachToFetcher(
         fetcher_.get(),
         data_use_measurement::DataUseUserData::DATA_REDUCTION_PROXY);
-    fetcher_->SetLoadFlags(net::LOAD_BYPASS_CACHE |
-                           net::LOAD_DO_NOT_SEND_COOKIES |
-                           net::LOAD_DO_NOT_SAVE_COOKIES);
+    // Do not disable cookies. This allows the warmup connection to be reused
+    // for fetching user initiated requests.
+    fetcher_->SetLoadFlags(net::LOAD_BYPASS_CACHE);
     fetcher_->SetRequestContext(url_request_context_getter_.get());
     // |fetcher| should not retry on 5xx errors.
     fetcher_->SetAutomaticallyRetryOn5xx(false);