Fix CrSettingsPersonalizationOptionsTest.OfficialBuild tests

The number of settings-toggle-button elements on the
personalization_options.html page changed with
https://chromium-review.googlesource.com/c/chromium/src/+/1145315.

This CL updates the test that checks this number.

Bug: 867410
Change-Id: Ie4cca8a3305b1c8677a4e9a599ec531ff6fcab78
Reviewed-on: https://chromium-review.googlesource.com/1150157Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577879}

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

@@ -89,10 +89,13 @@ cr.define('settings_personalization_options', function() {
         testElement.unifiedConsentEnabled = false;
         Polymer.dom.flush();
         assertEquals(
-            8,
+            7,
             testElement.root.querySelectorAll('settings-toggle-button').length);
         testElement.unifiedConsentEnabled = true;
         Polymer.dom.flush();
+        assertEquals(
+            8,
+            testElement.root.querySelectorAll('settings-toggle-button').length);
       });
     });
   }