Fix build with use_system_zlib=1

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 51 matching lines @@
     },
     {
       'target_name': 'nss',
       'type': 'settings',
       'conditions': [
         ['_toolset=="target"', {
           'conditions': [
             ['use_system_ssl==0', {
               'dependencies': [
                 '../../net/third_party/nss/nss.gyp:ssl',
+                '../../third_party/zlib/zlib.gyp:zlib',
               ],
               'direct_dependent_settings': {
                 'cflags': [
                   '-Inet/third_party/nss/ssl',
                   '<!@(<(pkg-config) --cflags nss)',
                 ],
               },
               'link_settings': {
                 'ldflags': [
                   '<!@(<(pkg-config) --libs-only-L --libs-only-other nss)',
@@ skipping 173 matching lines @@
 #       },
 #     },
   ],
 }
 
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 # indent-tabs-mode:nil
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