Increase Bind/Callback Arity from 6 -> 7.

base/bind_internal.h.pump

 $$ This is a pump file for generating file templates.  Pump is a python
 $$ script that is part of the Google Test suite of utilities.  Description
 $$ can be found here:
 $$
 $$ http://code.google.com/p/googletest/wiki/PumpManual
 $$
 
-// TODO(ajwong): If you create an fully unbound method, is there a way to
-// enforce the first argument must be refcounted?  Or do we just say
-// "oh well"?
-//
-// Do we want to allow creating a fully unbound method??
-
-$var MAX_ARITY = 6
+$$ See comment for MAX_ARITY in base/bind.h.pump.
+$var MAX_ARITY = 7
 $range ARITY 0..MAX_ARITY
 
 // Copyright (c) 2011 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.
 
 #ifndef BASE_BIND_INTERNAL_H_
 #define BASE_BIND_INTERNAL_H_
 #pragma once
 
@@ skipping 466 matching lines @@
 
 ]]
 };
 
 ]] $$ for ARITY
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_BIND_INTERNAL_H_