[iOS][GN] Port ios_web_unittests to build with gn

ios/web/ios_web_unittests.gyp

 # Copyright 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
+      # GN version: //ios/web:ios_web_unittests
       'target_name': 'ios_web_unittests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:test_support_base',
         '../../net/net.gyp:net_test_support',
         '../../testing/gmock.gyp:gmock',
         '../../testing/gtest.gyp:gtest',
         '../../third_party/ocmock/ocmock.gyp:ocmock',
         '../../ui/base/ui_base.gyp:ui_base_test_support',
@@ skipping 73 matching lines @@
               'test/data/testpass.pkpass',
             ],
             'test_data_prefix': 'ios/web',
           },
           'includes': [ '../../build/copy_test_data_ios.gypi' ],
         },
       ],
     },
   ],
 }