Re-enable Privacy Page UMA logging tests

Troublesome Privacy Page UMA logging tests were disabled in anticipation
of a major UMA rework. That rework has come and gone but erroneously
did not renable the privacy_page specific tests.

Fixed: 1066182
Change-Id: I9291aa353aeebd581f164615e9e6033d9e53dbad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129698
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755069}

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

@@ -1050,8 +1050,7 @@ TEST_F(
       runMochaSuite('PrivacyPageSound');
     });
 
-// TODO(sauski): Privacy page UMA changing, tests need updating/removal.
-TEST_F('CrSettingsPrivacyPageTest', 'DISABLED_UMALoggingTests', function() {
+TEST_F('CrSettingsPrivacyPageTest', 'UMALoggingTests', function() {
   runMochaSuite('PrivacyPageUMACheck');
 });