GN: Work on Linux build defines

tools/gn/secondary/crypto/ssl/flags.gni

Index: tools/gn/secondary/crypto/ssl/flags.gni
diff --git a/tools/gn/secondary/crypto/ssl/flags.gni b/tools/gn/secondary/crypto/ssl/flags.gni
deleted file mode 100644
index 6891c49ea585cddecde7d24787e402ff2d12dcdc..0000000000000000000000000000000000000000
--- a/tools/gn/secondary/crypto/ssl/flags.gni
+++ /dev/null
@@ -1,17 +0,0 @@
-# Copyright (c) 2013 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.
-
-# This file declares build flags for the SSL library configuration.
-
-declare_args() {
-  # Use OpenSSL instead of NSS. This is used for Android and is experimental
-  # in other cases (see http://crbug.com/62803).
-  use_openssl = false
-}
-
-if (is_linux && !use_openssl) {
-  use_nss = true
-} else {
-  use_nss = false
-}