Fixes some memory leaks in //runtime/bin

runtime/bin/crypto.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef BIN_CRYPTO_H_
 #define BIN_CRYPTO_H_
 
 #include "bin/builtin.h"
 #include "bin/utils.h"
 
-
 namespace dart {
 namespace bin {
 
 class Crypto {
  public:
   static bool GetRandomBytes(intptr_t count, uint8_t* buffer);
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Crypto);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_CRYPTO_H_