[sheriff] Disable CrSettingsPasswordsSectionV3Test.All on Mac.

R=dpapad@chromium.org
TBR=fdoray@chromium.org

Bug: 1090931
Change-Id: I54130c0b9a08766b8f162c2abcfc6ae04ddf2c79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228128Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774791}

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

@@ -214,9 +214,16 @@ var CrSettingsPasswordsSectionV3Test = class extends CrSettingsV3BrowserTest {
   }
 };
 
-TEST_F('CrSettingsPasswordsSectionV3Test', 'All', function() {
+// Flaky on Mac https://crbug.com/1090931
+GEN('#if defined(OS_MACOSX)');
+GEN('#define MAYBE_All DISABLED_All');
+GEN('#else');
+GEN('#define MAYBE_All All');
+GEN('#endif');
+TEST_F('CrSettingsPasswordsSectionV3Test', 'MAYBE_All', function() {
   mocha.run();
 });
+GEN('#undef MAYBE_All');
 
 // eslint-disable-next-line no-var
 var CrSettingsMultiStorePasswordUiEntryV3Test =