Fix group datadeps

tools/gn/gn.gyp

 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'gn_lib',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
@@ skipping 196 matching lines @@
         'functions_target_unittest.cc',
         'functions_unittest.cc',
         'header_checker_unittest.cc',
         'input_conversion_unittest.cc',
         'label_pattern_unittest.cc',
         'label_unittest.cc',
         'loader_unittest.cc',
         'ninja_action_target_writer_unittest.cc',
         'ninja_binary_target_writer_unittest.cc',
         'ninja_copy_target_writer_unittest.cc',
+        'ninja_group_target_writer_unittest.cc',
         'ninja_target_writer_unittest.cc',
         'ninja_toolchain_writer_unittest.cc',
         'operators_unittest.cc',
         'parse_tree_unittest.cc',
         'parser_unittest.cc',
         'path_output_unittest.cc',
         'pattern_unittest.cc',
         'run_all_unittests.cc',
         'scope_per_file_provider_unittest.cc',
         'scope_unittest.cc',
@@ skipping 21 matching lines @@
       'type': 'executable',
       'sources': [
         'generate_test_gn_data.cc',
       ],
       'dependencies': [
         '../../base/base.gyp:base',
       ],
     }
   ],
 }