add missing zlib dep after CL 1148633007

content/content_tests.gypi

 # 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.
 
 {
   'variables': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 1371 matching lines @@
             '../ppapi/ppapi_internal.gyp:ppapi_unittest_shared',
             '../testing/gmock.gyp:gmock',
             '../testing/gtest.gyp:gtest',
             '../third_party/WebKit/public/blink.gyp:blink',
             '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
             '../third_party/mesa/mesa.gyp:osmesa',
             '../third_party/mojo/mojo_edk.gyp:mojo_common_test_support',
             '../third_party/mojo/mojo_edk.gyp:mojo_system_impl',
             '../third_party/mojo/mojo_public.gyp:mojo_cpp_bindings',
             '../third_party/mojo/mojo_public.gyp:mojo_js_bindings',
+            '../third_party/zlib/zlib.gyp:zlib',
             '../ui/accessibility/accessibility.gyp:accessibility',
             '../ui/base/ui_base.gyp:ui_base',
             '../ui/gfx/gfx.gyp:gfx',
             '../ui/gfx/gfx.gyp:gfx_geometry',
             '../ui/gl/gl.gyp:gl',
             '../ui/resources/ui_resources.gyp:ui_resources',
             '../ui/shell_dialogs/shell_dialogs.gyp:shell_dialogs',
             '../ui/snapshot/snapshot.gyp:snapshot',
             '../ui/accessibility/accessibility.gyp:ax_gen',
           ],
@@ skipping 783 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }