Backed out changeset 188d22215166 (bug 1057512) for causing dt2 memory leaks

testing/mochitest/runtests.py

@@ -1711,9 +1711,8 @@ class Mochitest(MochitestUtilsMixin):
 
     self.setTestRoot(options)
 
-    # This runs on bc* and dt* jobs only
+    # Until we have all green, this only runs on bc* jobs (not dt* jobs)
-    # We need to fix tests on plain|chrome|webapprt|a11y before making this default
+    if options.browserChrome and not options.subsuite:
-    if options.browserChrome:
       options.runByDir = True
 
     if not options.runByDir: