Disabled flaky CrSettingsPrivacyPageTest.PrivacyPage test

TBR=dpapad@chromium.org
BUG=642574,625332

Review-Url: https://codereview.chromium.org/2298113002
Cr-Commit-Position: refs/heads/master@{#415596}

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

@@ -442,7 +442,8 @@ CrSettingsPrivacyPageTest.prototype = {
   ]),
 };
 
-TEST_F('CrSettingsPrivacyPageTest', 'PrivacyPage', function() {
+// TODO(crbug.com/642574) Disabled because test is flaky.
+TEST_F('CrSettingsPrivacyPageTest', 'DISABLED_PrivacyPage', function() {
   settings_privacy_page.registerTests();
   mocha.run();
 });