Settings: enable PrivacyPage's PrivacySandbox test suite

Bug: 1152336
Change-Id: I3ac333ff8fd31838c270dd5e0814c4c017850e71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2639758Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Rainhard Findling <rainhard@chromium.org>
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845130}

chrome/test/data/webui/settings/cr_settings_v3_browsertest.js

@@ -408,6 +408,11 @@ TEST_F('CrSettingsPrivacyPageV3Test', 'ContentSettingsRedesign', function() {
   runMochaSuite('ContentSettingsRedesign');
 });
 
+TEST_F(
+    'CrSettingsPrivacyPageV3Test', 'PrivacySandboxSettingsEnabled', function() {
+      runMochaSuite('PrivacySandboxSettingsEnabled');
+    });
+
 // TODO(crbug.com/1043665): flaky crash on Linux Tests (dbg).
 TEST_F(
     'CrSettingsPrivacyPageV3Test', 'DISABLED_PrivacyPageSoundTests',

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

@@ -166,6 +166,7 @@ suite('PrivacySandboxSettingsEnabled', function() {
     page = /** @type {!SettingsPrivacyPageElement} */
         (document.createElement('settings-privacy-page'));
     document.body.appendChild(page);
+    return flushTasks();
   });
 
   test('privacySandboxRowVisible', function() {