Get rid of duplicate LICENSE entry for the Valgrind...

LICENSE

 This license applies to all parts of V8 that are not externally
 maintained libraries.  The externally maintained libraries used by V8
 are:
 
   - PCRE test suite, located in
     test/mjsunit/third_party/regexp-pcre.js.  This is based on the
     test suite from PCRE-7.3, which is copyrighted by the University
     of Cambridge and Google, Inc.  The copyright notice and license
     are embedded in regexp-pcre.js.
 
   - Layout tests, located in test/mjsunit/third_party.  These are
     based on layout tests from webkit.org which are copyrighted by
     Apple Computer, Inc. and released under a 3-clause BSD license.
 
   - Dtoa, located under third_party/dtoa.  This code is copyrighted by
     David M. Gay and released under an MIT license.
 
   - Strongtalk assembler, the basis of the files assembler-arm-inl.h,
     assembler-arm.cc, assembler-arm.h, assembler-ia32-inl.h,
     assembler-ia32.cc, assembler-ia32.h, assembler.cc and assembler.h.
     This code is copyrighted by Sun Microsystems Inc. and released
     under a 3-clause BSD license.
 
   - Valgrind client API header, located at third_party/valgrind/valgrind.h
     This is release under the BSD license.
 
-  - Valgrind client API header, located at third_party/valgrind/valgrind.h
-    This is release under the BSD license.
-
 These libraries have their own licenses; we recommend you read them,
 as their terms may differ from the terms below.
 
 Copyright 2006-2009, Google Inc. All rights reserved.
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
 met:
 
     * Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
     * Redistributions in binary form must reproduce the above
       copyright notice, this list of conditions and the following
       disclaimer in the documentation and/or other materials provided
       with the distribution.
     * Neither the name of Google Inc. nor the names of its
       contributors may be used to endorse or promote products derived
       from this software without specific prior written permission.
 
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 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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