Bug 1273759 - Fix bad interaction between bug 1197310 and bug 1264017 by making the location-setting an absolute URL. rs=me on a CLOSED TREE

MozReview-Commit-ID: AAcIPDqPm9n

gfx/layers/apz/test/mochitest/apz_test_utils.js

@@ -191,7 +191,7 @@ function runSubtestsSeriallyInFreshWindows(aSubtests) {
         w.SimpleTest = SimpleTest;
         w.is = is;
         w.ok = ok;
-        w.location = test.file;
+        w.location = location.href.substring(0, location.href.lastIndexOf('/') + 1) + aFile;
         return w;
       }