Linux: add next-protocol-negotiation to libssl.

build/linux/system.gyp

 # Copyright (c) 2009 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.
 
 {
   'conditions': [
     ['sysroot!=""', {
       'variables': {
         'pkg-config': './pkg-config-wrapper "<(sysroot)"',
       },
@@ skipping 71 matching lines @@
                 ],
                 'libraries': [
                   '<!@(<(pkg-config) --libs-only-l nss | sed -e "s/-lssl3//")',
                 ],
               },
           }, {
               'direct_dependent_settings': {
                 'cflags': [
                   '<!@(<(pkg-config) --cflags nss)',
                 ],
+                'defines': [
+                  'USE_SYSTEM_SSL',
+                ],
               },
               'link_settings': {
                 'ldflags': [
                   '<!@(<(pkg-config) --libs-only-L --libs-only-other nss)',
                 ],
                 'libraries': [
                   '<!@(<(pkg-config) --libs-only-l nss)',
                 ],
               },
           }]]
@@ skipping 150 matching lines @@
 #       },
 #     },
   ],
 }
 
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