Disable CrSettingsPrivacyPageTest.All on all platform

The test has been disabld on Mac already, but it's also flaky on win,
linux and chromeos. Disable the tests on all platforms.

Bug: 877109
Tbr: hcarmona@chromium.org
Change-Id: I8e2d1e205b5d4077194898ee82337656135e299a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935838Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719219}

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

@@ -1161,14 +1161,9 @@ CrSettingsPrivacyPageTest.prototype = {
     'privacy_page_test.js',
   ]),
 };
-// Disabling on Mac due to flakiness.
+// Disabling on all platforms due to flakiness.
 // https://crbug.com/877109
-GEN('#if defined(OS_MACOSX)');
-GEN('#define MAYBE_All2 DISABLED_All');
-GEN('#else');
-GEN('#define MAYBE_All2 All');
-GEN('#endif');
-TEST_F('CrSettingsPrivacyPageTest', 'MAYBE_All2', function() {
+TEST_F('CrSettingsPrivacyPageTest', 'DISABLED_All', function() {
   mocha.run();
 });