Fix some issues found looking at the code....

base/hmac_win.cc

 // Copyright (c) 2006-2008 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.
 
 #include "base/hmac.h"
 
 #include <windows.h>
 #include <wincrypt.h>
 
 #include <algorithm>
@@ skipping 49 matching lines @@
   SecureZeroMemory(key_blob->key_data, key_length);
 }
 
 HMAC::~HMAC() {
   if (plat_->hkey_)
     CryptDestroyKey(plat_->hkey_);
   if (plat_->hash_)
     CryptDestroyHash(plat_->hash_);
   if (plat_->provider_)
     CryptReleaseContext(plat_->provider_, 0);
-
-  delete plat_;
 }
 
 bool HMAC::Sign(const std::string& data,
                 unsigned char* digest,
                 int digest_length) {
   if (!plat_->provider_ || !plat_->hkey_)
     return false;
 
   if (hash_alg_ != SHA1) {
     NOTREACHED();
@@ skipping 17 matching lines @@
     return false;
 
   DWORD sha1_size = digest_length;
   if (!CryptGetHashParam(plat_->hash_, HP_HASHVAL, digest, &sha1_size, 0))
     return false;
 
   return true;
 }
 
 }  // namespace base