Bug 1434983: Make screenshare and windowshare test one-way, to work around limitations on OS X. r=pehrsons

MozReview-Commit-ID: Ldy7Wb3ZSPQ

--HG--
extra : rebase_source : 543c9c107e3f5b44f1744977e494ddd000e07368

dom/media/tests/mochitest/test_peerConnection_basicScreenshare.html

@@ -27,7 +27,7 @@
       },
       fake: false
     };
-    test.setMediaConstraints([constraints], [constraints]);
+    test.setMediaConstraints([constraints], []);
     test.run();
   });
 </script>

dom/media/tests/mochitest/test_peerConnection_basicWindowshare.html

@@ -27,7 +27,7 @@
       },
       fake: false
     };
-    test.setMediaConstraints([constraints], [constraints]);
+    test.setMediaConstraints([constraints], []);
     test.run();
   });
 </script>