Bug 1607975 - Disabled dom/indexedDB/test/browser_bug839193.js on Windows 7. r=ttung DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D68096

--HG--
extra : moz-landing-system : lando

dom/indexedDB/test/browser.ini

@@ -27,3 +27,4 @@ skip-if = os == 'linux' && debug # bug 1394671
 [browser_private_idb.js]
 skip-if = (os == 'mac' && debug) || (os == 'win' && debug) # Bug 1456325
 [browser_bug839193.js]
+skip-if = os == 'win' && bits == 32 # Bug 1607975