Remove unused copy_chromedriver target

tools/copy_binary.py

@@ -1,12 +0,0 @@
-#!/usr/bin/env python
-
-import os
-import shutil
-import stat
-import sys
-
-src = sys.argv[1]
-dist = sys.argv[2]
-
-shutil.copyfile(src, dist)
-os.chmod(dist, os.stat(dist).st_mode | stat.S_IEXEC)