Move DEPS file docs into a README.md

checkdeps/graphdeps.py

 #!/usr/bin/env python
 # Copyright 2013 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.
 
 """Dumps a graph of allowed and disallowed inter-module dependencies described
 by the DEPS files in the source tree. Supports DOT and PNG as the output format.
 
 Enables filtering and differential highlighting of parts of the graph based on
 the specified criteria. This allows for a much easier visual analysis of the
 dependencies, including answering questions such as "if a new source must
 depend on modules A, B, and C, what valid options among the existing modules
 are there to put it in."
 
-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 pipes
 import re
 import sys
 
 from builddeps import DepsBuilder
 from rules import Rule
@@ skipping 371 matching lines @@
   print 'exclude nodes       : ', options.excl
   print 'highlight fanins of : ', options.hilite_fanins
   print 'highlight fanouts of: ', options.hilite_fanouts
 
   deps_grapher.DumpDependencies()
   return 0
 
 
 if '__main__' == __name__:
   sys.exit(main())