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 5f96c3172de69219b2c1cf9384d92837b2df12e3..882c21fd51169f5c0795f490f98af9e6783f2d69 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -605,7 +605,6 @@
     ],
     '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',
@@ -2154,7 +2153,6 @@
           'conditions': [
             ['chromeos == 1', {
               'sources!': [
-                'browser/ui/sync/one_click_signin_helper_unittest.cc',
                 'browser/ui/sync/one_click_signin_sync_starter_unittest.cc',
               ],
             }],