Revert of Remove Referrer Policy from URLFetcher.

net/url_request/url_fetcher_core.cc

Index: net/url_request/url_fetcher_core.cc
diff --git a/net/url_request/url_fetcher_core.cc b/net/url_request/url_fetcher_core.cc
index b3f742f6ba212ce35f1c915d301862c7c18f43dc..eb45ecf52e3755789f2d1fd2a2de27646d8cdc71 100644
--- a/net/url_request/url_fetcher_core.cc
+++ b/net/url_request/url_fetcher_core.cc
@@ -82,6 +82,8 @@
       upload_content_set_(false),
       upload_range_offset_(0),
       upload_range_length_(0),
+      referrer_policy_(
+          URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE),
       is_chunked_upload_(false),
       was_cancelled_(false),
       stop_on_redirect_(false),
@@ -204,6 +206,11 @@
   referrer_ = referrer;
 }
 
+void URLFetcherCore::SetReferrerPolicy(
+    URLRequest::ReferrerPolicy referrer_policy) {
+  referrer_policy_ = referrer_policy;
+}
+
 void URLFetcherCore::SetExtraRequestHeaders(
     const std::string& extra_request_headers) {
   extra_request_headers_.Clear();
@@ -510,6 +517,7 @@
     request_->EnableChunkedUpload();
   request_->SetLoadFlags(flags);
   request_->SetReferrer(referrer_);
+  request_->set_referrer_policy(referrer_policy_);
   request_->set_first_party_for_cookies(first_party_for_cookies_.is_empty() ?
       original_url_ : first_party_for_cookies_);
   if (url_request_data_key_ && !url_request_create_data_callback_.is_null()) {