Bug 1329547 - Remove media test checks for Vista: Follow-up: Add back check for Windows to fix bustage. r=RyanVM

dom/media/test/manifest.js

@@ -540,7 +540,8 @@ var gErrorTests = [
 
 // Windows' H.264 decoder cannot handle H.264 streams with resolution
 // less than 48x48 pixels. We refuse to play and error on such streams.
-if (manifestVideo().canPlayType('video/mp4; codecs="avc1.42E01E"')) {
+if (manifestNavigator().userAgent.includes("Windows") &&
+    manifestVideo().canPlayType('video/mp4; codecs="avc1.42E01E"')) {
   gErrorTests = gErrorTests.concat({name: "red-46x48.mp4", type:"video/mp4"},
                                    {name: "red-48x46.mp4", type:"video/mp4"});
 }