Use :rfc1034identifier modifier to remove '_' in BUNDLE_ID_TEST_NAME.

testing/gtest.gyp

 # Copyright (c) 2012 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.
 
 {
   'includes': [
     'gtest.gypi',
   ],
   'targets': [
     {
@@ skipping 46 matching lines @@
               # type of executable supported for iOS.
               ['_type=="executable"', {
                 'variables': {
                   # Use a variable so the path gets fixed up so it is always
                   # correct when INFOPLIST_FILE finally gets set.
                   'ios_unittest_info_plist_path':
                     '<(DEPTH)/testing/gtest_ios/unittest-Info.plist',
                 },
                 'mac_bundle': 1,
                 'xcode_settings': {
-                  'BUNDLE_ID_TEST_NAME':
-                    '>!(echo ">(_target_name)" | sed -e "s/_//g")',
+                  'BUNDLE_ID_TEST_NAME': '>(_target_name)',
                   'INFOPLIST_FILE': '>(ios_unittest_info_plist_path)',
                 },
                 'mac_bundle_resources': [
                   '<(ios_unittest_info_plist_path)',
                   '<(DEPTH)/testing/gtest_ios/Default.png',
                 ],
                 'mac_bundle_resources!': [
                   '<(ios_unittest_info_plist_path)',
                 ],
               }],
@@ skipping 126 matching lines @@
     {
       'target_name': 'gtest_prod',
       'toolsets': ['host', 'target'],
       'type': 'none',
       'sources': [
         'gtest/include/gtest/gtest_prod.h',
       ],
     },
   ],
 }