Bug 1360667 - Change location of coverage collection in xpcshell. r=jmaher

MozReview-Commit-ID: EsA8hTKd15Y

--HG--
extra : rebase_source : 4f2e5bd8b2ecb6dee6b2b85f9687b62feb6c9531

testing/xpcshell/head.js

@@ -538,13 +538,13 @@ function _execute_test() {
       run_next_test();
     }
 
-    if (coverageCollector != null) {
-      coverageCollector.recordTestCoverage(_TEST_FILE[0]);
-    }
-
     do_test_finished("MAIN run_test");
     _do_main();
     _PromiseTestUtils.assertNoUncaughtRejections();
+
+    if (coverageCollector != null) {
+      coverageCollector.recordTestCoverage(_TEST_FILE[0]);
+    }
   } catch (e) {
     _passed = false;
     // do_check failures are already logged and set _quit to true and throw