fix a problem that android cannot download files with basic authentication

net/http/http_network_transaction.cc

Index: net/http/http_network_transaction.cc
diff --git a/net/http/http_network_transaction.cc b/net/http/http_network_transaction.cc
index 54d79f3ab78d9e6ac8c1a9cff8a60937652efc89..81007ca3d9bb5f1b87eecf450737a034c982a3c8 100644
--- a/net/http/http_network_transaction.cc
+++ b/net/http/http_network_transaction.cc
@@ -316,6 +316,11 @@ bool HttpNetworkTransaction::IsReadyToRestartForAuth() {
       HaveAuth(pending_auth_target_);
 }
 
+bool HttpNetworkTransaction::HasAuth() const {
+  return request_headers_.HasHeader(HttpRequestHeaders::kProxyAuthorization) ||
+      request_headers_.HasHeader(HttpRequestHeaders::kAuthorization);
+}
+
 int HttpNetworkTransaction::Read(IOBuffer* buf, int buf_len,
                                  const CompletionCallback& callback) {
   DCHECK(buf);