Move DEPS file docs into a README.md

checkdeps/checkdeps.py

 #!/usr/bin/env python
 # Copyright 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Makes sure that files include headers from allowed directories.
 
 Checks DEPS files in the source tree for rules, and applies those rules to
 "#include" and "import" directives in the .cpp, .java, and .proto source files.
 Any source file including something not permitted by the DEPS files will fail.
 
-See builddeps.py for a detailed description of the DEPS format.
+See README.md for a detailed description of the DEPS format.
 """
 
 import os
 import optparse
 import re
 import sys
 
 import proto_checker
 import cpp_checker
 import java_checker
@@ skipping 254 matching lines @@
   if options.json:
     deps_checker.results_formatter = results.JSONResultsFormatter(
         options.json, deps_checker.results_formatter)
 
   deps_checker.CheckDirectory(start_dir)
   return deps_checker.Report()
 
 
 if '__main__' == __name__:
   sys.exit(main())