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

base/hmac_mac.cc

 // Copyright (c) 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 <CommonCrypto/CommonHMAC.h>
 
 #include "base/logging.h"
 
 namespace base {
 
 struct HMACPlatformData {
   std::string key_;
 };
 
 HMAC::HMAC(HashAlgorithm hash_alg, const unsigned char* key, int key_length)
     : hash_alg_(hash_alg), plat_(new HMACPlatformData()) {
   plat_->key_.assign(reinterpret_cast<const char*>(key), key_length);
 }
 
 HMAC::~HMAC() {
   // Zero out key copy.
   plat_->key_.assign(plat_->key_.length(), std::string::value_type());
   plat_->key_.clear();
   plat_->key_.reserve(0);
-
-  delete plat_;
 }
 
 bool HMAC::Sign(const std::string& data,
                 unsigned char* digest,
                 int digest_length) {
   CCHmacAlgorithm algorithm;
   int algorithm_digest_length;
   switch (hash_alg_) {
     case SHA1:
       algorithm = kCCHmacAlgSHA1;
@@ skipping 10 matching lines @@
   }
 
   CCHmac(algorithm,
          plat_->key_.data(), plat_->key_.length(), data.data(), data.length(),
          digest);
 
   return true;
 }
 
 }  // namespace base