Remove unneeded main.

printing/printing.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 62 matching lines @@
         }],
       ],
     },
     {
       'target_name': 'printing_unittests',
       'type': 'executable',
       'msvs_guid': '8B2EE5D9-41BC-4AA2-A401-2DC143A05D2E',
       'dependencies': [
         'printing',
         '../testing/gtest.gyp:gtest',
-        '../testing/gtest.gyp:gtestmain',
       ],
       'sources': [
         'emf_win_unittest.cc',
         'printing_test.h',
         'page_number_unittest.cc',
         'page_overlays_unittest.cc',
         'page_range_unittest.cc',
         'page_setup_unittest.cc',
         'pdf_ps_metafile_linux_unittest.cc',
         'printing_context_win_unittest.cc',
@@ skipping 10 matching lines @@
         ],
         ['OS=="linux"', {
             'dependencies': [
               '../build/linux/system.gyp:gtk',
            ],
         }],
       ],
     },
   ],
 }