Revert "sheriff: disable CrSettingsPeoplePageSyncControlsTest.All"

The CL that was causing the failure has been reverted in
8d4d0ff0. Re-enabling the tests.

This reverts commit 1ea2a91b.

Bug: 1043665
Change-Id: Idd8d15db36bb35cf76b9172baff381ac2f78c8d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2019368Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735338}

chrome/test/data/webui/settings/cr_settings_browsertest.js

@@ -517,8 +517,7 @@ CrSettingsPeoplePageSyncControlsTest.prototype = {
   ]),
 };
 
-// TODO(crbug.com/1043665): disabling due to deterministic failures.
-TEST_F('CrSettingsPeoplePageSyncControlsTest', 'DISABLED_All', function() {
+TEST_F('CrSettingsPeoplePageSyncControlsTest', 'All', function() {
   mocha.run();
 });