Remove OneClickSigninHelper since it is no longer used.

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       '../components/autofill/content/renderer/test_password_autofill_agent.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.h',
       '../components/autofill/content/renderer/test_password_generation_agent.cc',
       '../components/autofill/content/renderer/test_password_generation_agent.h',
@@ skipping 587 matching lines @@
       '../tools/json_schema_compiler/test/error_generation_unittest.cc',
       '../tools/json_schema_compiler/test/functions_as_parameters_unittest.cc',
       '../tools/json_schema_compiler/test/functions_on_types_unittest.cc',
       '../tools/json_schema_compiler/test/idl_schemas_unittest.cc',
       '../tools/json_schema_compiler/test/objects_unittest.cc',
       '../tools/json_schema_compiler/test/simple_api_unittest.cc',
       '../ui/webui/resources/js/cr.js',
     ],
     'chrome_unit_tests_one_click_signin_sources': [
       'browser/ui/cocoa/one_click_signin_bubble_controller_unittest.mm',
-      'browser/ui/sync/one_click_signin_helper_unittest.cc',
       'browser/ui/sync/one_click_signin_sync_observer_unittest.cc',
       'browser/ui/sync/one_click_signin_sync_starter_unittest.cc',
       'browser/ui/views/sync/one_click_signin_bubble_view_unittest.cc',
     ],
     'chrome_unit_tests_spellchecker_sources': [
       'browser/spellchecker/spellcheck_action_unittest.cc',
       'browser/spellchecker/spellcheck_custom_dictionary_unittest.cc',
       'browser/spellchecker/spellcheck_host_metrics_unittest.cc',
       'browser/spellchecker/spellcheck_message_filter_mac_unittest.cc',
       'browser/spellchecker/spellcheck_message_filter_unittest.cc',
@@ skipping 1528 matching lines @@
             ['OS!="mac" and OS!="ios"', {
               'dependencies': [ '../third_party/hunspell/hunspell.gyp:hunspell' ],
             }],
           ],
         }],
         ['enable_one_click_signin==1', {
           'sources': [ '<@(chrome_unit_tests_one_click_signin_sources)' ],
           'conditions': [
             ['chromeos == 1', {
               'sources!': [
-                'browser/ui/sync/one_click_signin_helper_unittest.cc',
                 'browser/ui/sync/one_click_signin_sync_starter_unittest.cc',
               ],
             }],
             ['toolkit_views == 0', {
               'sources!': [
                 'browser/ui/views/sync/one_click_signin_bubble_view_unittest.cc',
               ],
             }],
           ],
         }],
@@ skipping 572 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }