run iwyu on base!

base/hmac_mac.cc

 // Copyright (c) 2010 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 <CommonCrypto/CommonDigest.h>
+#include <CommonCrypto/CommonHMAC.h>
+#include <string>
+
 #include "base/hmac.h"
-
-#include <CommonCrypto/CommonHMAC.h>
-
 #include "base/logging.h"
+#include "base/scoped_ptr.h"
 
 namespace base {
 
 struct HMACPlatformData {
   std::string key_;
 };
 
 HMAC::HMAC(HashAlgorithm hash_alg)
     : hash_alg_(hash_alg), plat_(new HMACPlatformData()) {
   // Only SHA-1 and SHA-256 hash algorithms are supported now.
@@ skipping 44 matching lines @@
   }
 
   CCHmac(algorithm,
          plat_->key_.data(), plat_->key_.length(), data.data(), data.length(),
          digest);
 
   return true;
 }
 
 }  // namespace base