Added the AutoEnrollmentClient and unit tests for it.

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index c329517023773200f1d054c0a8df87a95538314c..7f97ef86bbe1939bd9ba788d2976e746fc7bea0e 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -1515,6 +1515,7 @@
         'browser/policy/asynchronous_policy_provider_unittest.cc',
         'browser/policy/asynchronous_policy_test_base.cc',
         'browser/policy/asynchronous_policy_test_base.h',
+        'browser/policy/auto_enrollment_client_unittest.cc',
         'browser/policy/cloud_policy_controller_unittest.cc',
         'browser/policy/cloud_policy_provider_unittest.cc',
         'browser/policy/cloud_policy_subsystem_unittest.cc',
@@ -2118,6 +2119,7 @@
           'sources/': [
             ['exclude', '^browser/chromeos/'],
             ['exclude', '^browser/oom_priority_manager_unittest.cc'],
+            ['exclude', '^browser/policy/auto_enrollment_client_unittest.cc' ],
             ['exclude', '^browser/policy/configuration_policy_handler_chromeos_unittest.cc' ],
             ['exclude', '^browser/policy/device_policy_cache_unittest.cc'],
             ['exclude', '^browser/policy/enterprise_install_attributes_unittest.cc' ],