Bug 1446760 - Disable browser_dbg-stepping.js for frequent failures on Windows r=jmaher

--HG--
extra : rebase_source : 64a99f4dafa8f39d782e87a12f33d7ee5eb47079

devtools/client/debugger/new/test/mochitest/browser.ini

@@ -229,7 +229,7 @@ skip-if = os == 'linux' && !asan # bug 1447118
 [browser_dbg-sources.js]
 [browser_dbg-sources-named-eval.js]
 [browser_dbg-stepping.js]
-skip-if = debug || (verify && (os == 'win'))
+skip-if = debug || (verify && (os == 'win')) || (os == "win" && os_version == "6.1")
 [browser_dbg-tabs.js]
 [browser_dbg-tabs-pretty-print.js]
 [browser_dbg-toggling-tools.js]