Use OS_WIN instead of OS_WINDOWS to disable flaky ContentSettingsExceptionAreaWebUITest.testOpenCon…

chrome/browser/ui/webui/options/content_settings_exception_area_browsertest.js

Index: chrome/browser/ui/webui/options/content_settings_exception_area_browsertest.js
diff --git a/chrome/browser/ui/webui/options/content_settings_exception_area_browsertest.js b/chrome/browser/ui/webui/options/content_settings_exception_area_browsertest.js
index 23a3914a1952e7bbe79bafc4983aa59ef368be6a..d93d0fed56ece1fec5193275916ae223c0ffbb20 100644
--- a/chrome/browser/ui/webui/options/content_settings_exception_area_browsertest.js
+++ b/chrome/browser/ui/webui/options/content_settings_exception_area_browsertest.js
@@ -19,7 +19,7 @@ ContentSettingsExceptionAreaWebUITest.prototype = {
 };
 
 // See crbug.com/579666 for OS_LINUX and crbug.com/588586 for Windows.
-GEN('#if defined(OS_CHROMEOS) || defined(OS_LINUX) || defined(OS_WINDOWS)');
+GEN('#if defined(OS_CHROMEOS) || defined(OS_LINUX) || defined(OS_WIN)');
 GEN('#define MAYBE_testOpenContentSettingsExceptionArea ' +
         'DISABLED_testOpenContentSettingsExceptionArea');
 GEN('#else');