Include zlib.h properly

content/content_browser.gypi

 # Copyright (c) 2011 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': 'content_browser',
       'type': '<(library)',
       'dependencies': [
         'content_common',
         '../app/app.gyp:app_resources',
         '../ppapi/ppapi.gyp:ppapi_proxy',
         '../skia/skia.gyp:skia',
         '../third_party/flac/flac.gyp:libflac',
         '../third_party/speex/speex.gyp:libspeex',
         '../third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
+        '../third_party/zlib/zlib.gyp:zlib',
         '../ui/ui.gyp:ui_base',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'browser/appcache/appcache_dispatcher_host.cc',
         'browser/appcache/appcache_dispatcher_host.h',
         'browser/appcache/appcache_frontend_proxy.cc',
         'browser/appcache/appcache_frontend_proxy.h',
@@ skipping 351 matching lines @@
             'mac_bundle_resources': [
               'browser/gpu.sb',
               'browser/worker.sb',
             ],
           },
         }],
       ],
     },
   ],
 }