Remove runtests.py.in change from d3c2bf145fb8, accidentally committed.

testing/mochitest/runtests.py.in

@@ -467,9 +467,6 @@ Are you executing $objdir/_tests/testing/mochitest/runtests.py?"""
       testURL += "?" + "&".join(urlOpts)
 
   browserEnv["XPCOM_MEM_BLOAT_LOG"] = LEAK_REPORT_FILE
-  if options.a11y:
-    browserEnv["XPCOM_MEM_REFCNT_LOG"] = PROFILE_DIRECTORY + "/refcnt.log"
-    browserEnv["XPCOM_MEM_LOG_CLASSES"] = "imgRequest,imgCacheEntry"
 
   if options.fatalAssertions:
     browserEnv["XPCOM_DEBUG_BREAK"] = "stack-and-abort"