Disable CrSettingsPrivacyPageTest.All on Mac as it's flaky.

TBR=aee

Bug: 877109
Change-Id: I73a502d70b6ee1491589f5eba4fb07764e5f5d38
Reviewed-on: https://chromium-review.googlesource.com/1213506
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589558}

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

@@ -937,8 +937,14 @@ CrSettingsPrivacyPageTest.prototype = {
     'privacy_page_test.js',
   ]),
 };
-
-TEST_F('CrSettingsPrivacyPageTest', 'All', function() {
+// Disabling on Mac 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() {
   mocha.run();
 });