Bug 1422762 - Mark some updater unit tests as failing on Windows coverage builds until we figure out a way to get the build signed. r=jmaher

toolkit/mozapps/extensions/test/xpcshell/xpcshell.ini

@@ -30,6 +30,7 @@ tags = blocklist
 [test_ProductAddonChecker.js]
 [test_shutdown.js]
 [test_system_update_blank.js]
+fail-if = os == 'win' && ccov
 [test_system_update_checkSizeHash.js]
 [test_system_update_custom.js]
 [test_system_update_empty.js]

toolkit/mozapps/update/tests/unit_service_updater/xpcshell.ini

@@ -7,6 +7,7 @@
 [DEFAULT]
 tags = appupdate
 head = head_update.js
+fail-if = os == 'win' && ccov
 
 [bootstrapSvc.js]
 run-sequentially = Uses the Mozilla Maintenance Service.