Remove use_system_openssl.

build/linux/unbundle/openssl.gyp

Index: build/linux/unbundle/openssl.gyp
diff --git a/build/linux/unbundle/openssl.gyp b/build/linux/unbundle/openssl.gyp
deleted file mode 100644
index d832ba7be4d54c2307374c2a452e4210271d1618..0000000000000000000000000000000000000000
--- a/build/linux/unbundle/openssl.gyp
+++ /dev/null
@@ -1,25 +0,0 @@
-# Copyright 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.
-
-{
-  'targets': [
-    {
-      'target_name': 'openssl',
-      'type': 'none',
-      'direct_dependent_settings': {
-        'cflags': [
-          '<!@(pkg-config --cflags openssl)',
-        ],
-      },
-      'link_settings': {
-        'ldflags': [
-          '<!@(pkg-config --libs-only-L --libs-only-other openssl)',
-        ],
-        'libraries': [
-          '<!@(pkg-config --libs-only-l openssl)',
-        ],
-      },
-    }
-  ],
-}