Bug 1362903 - Clear gCurrentURL on reftest finishes. r=jmaher

MozReview-Commit-ID: 82jsXh702fj

layout/tools/reftest/reftest-content.js

@@ -833,6 +833,7 @@ function RecordResult()
     clearTimeout(gFailureTimeout);
     gFailureReason = null;
     gFailureTimeout = null;
+    gCurrentURL = null;
 
     if (gCurrentTestType == TYPE_SCRIPT) {
         var error = '';