Remove OneClickSigninHelper since it is no longer used.

chrome/chrome_tests_unit.gypi

Index: chrome/chrome_tests_unit.gypi
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index 07e47315a15fad6e58aef74c1c7495d4e00bce90..3bea65b9c408f0e42d9301ea721f17ed69b79ef6 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -609,7 +609,6 @@
     ],
     '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',
@@ -2164,7 +2163,6 @@
           'conditions': [
             ['chromeos == 1', {
               'sources!': [
-                'browser/ui/sync/one_click_signin_helper_unittest.cc',
                 'browser/ui/sync/one_click_signin_sync_starter_unittest.cc',
               ],
             }],