Revert of Upstream string_util function.

ios/chrome/ios_chrome_tests.gyp

 # Copyright 2014 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': [
     {
       'target_name': 'ios_chrome_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',
         '../ios_tests.gyp:test_support_ios',
         '../web/ios_web.gyp:ios_web',
         '../web/ios_web.gyp:test_support_ios_web',
         'ios_chrome.gyp:ios_chrome_browser',
-        'ios_chrome.gyp:ios_chrome_common',
         'ios_chrome_test_support',
       ],
       'sources': [
         'browser/net/image_fetcher_unittest.mm',
         'browser/net/metrics_network_client_unittest.mm',
         'browser/net/retryable_url_fetcher_unittest.mm',
         'browser/snapshots/snapshot_cache_unittest.mm',
         'browser/snapshots/snapshots_util_unittest.mm',
         'browser/translate/translate_service_ios_unittest.cc',
         'browser/ui/commands/set_up_for_testing_command_unittest.mm',
         'browser/ui/ui_util_unittest.mm',
         'browser/ui/uikit_ui_util_unittest.mm',
-        'common/string_util_unittest.mm',
       ],
     },
     {
       'target_name': 'ios_chrome_test_support',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../testing/gmock.gyp:gmock',
         '../../testing/gtest.gyp:gtest',
         '../provider/ios_provider_chrome.gyp:ios_provider_chrome_browser',
         'ios_chrome.gyp:ios_chrome_browser',
       ],
       'sources': [
         'browser/net/mock_image_fetcher.h',
         'browser/net/mock_image_fetcher.mm',
         'test/ios_chrome_unit_test_suite.cc',
         'test/ios_chrome_unit_test_suite.h',
         'test/run_all_unittests.cc',
         'test/testing_application_context.cc',
         'test/testing_application_context.h',
       ],
     },
   ],
 }