Fix license for valgrind

Make the LICENSE file more explicit about the fact that the headers used by Chromium use a BSD license.

BUG=138921

Review URL: https://chromiumcodereview.appspot.com/10843032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150082 0039d316-1c4b-4281-b951-d872f2087c98

base/third_party/valgrind/LICENSE

-   ----------------------------------------------------------------
-
-   Notice that the following BSD-style license applies to this one
-   file (valgrind.h) only.  The rest of Valgrind is licensed under the
-   terms of the GNU General Public License, version 2, unless
-   otherwise indicated.  See the COPYING file in the source
-   distribution for details.
+   Notice that the following BSD-style license applies to the Valgrind header
+   files used by Chromium (valgrind.h and memcheck.h). However, the rest of
+   Valgrind is licensed under the terms of the GNU General Public License,
+   version 2, unless otherwise indicated.
 
    ----------------------------------------------------------------
 
-   This file is part of Valgrind, a dynamic binary instrumentation
-   framework.
-
    Copyright (C) 2000-2008 Julian Seward.  All rights reserved.
 
    Redistribution and use in source and binary forms, with or without

base/third_party/valgrind/README.chromium

 Name: valgrind
 URL: http://valgrind.org
+License: BSD
 
 Header files in this directory define runtime macros that determine whether the
 current process is running under Valgrind and tell Memcheck tool about custom