Switch to standard integer types in components/, part 2 of 4.

components/gcm_driver/crypto/gcm_key_store.cc

 // Copyright 2015 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 "components/gcm_driver/crypto/gcm_key_store.h"
 
+#include <stddef.h>
+
 #include <utility>
 
 #include "base/logging.h"
 #include "components/gcm_driver/crypto/p256_key_util.h"
 #include "components/leveldb_proto/proto_database_impl.h"
 #include "crypto/random.h"
 
 namespace gcm {
 
 // Statistics are logged to UMA with this string as part of histogram name. They
@@ skipping 215 matching lines @@
     key_pairs_[entry.app_id()] = entry.keys(0);
     auth_secrets_[entry.app_id()] = entry.auth_secret();
   }
 
   state_ = State::INITIALIZED;
 
   delayed_task_controller_.SetReady();
 }
 
 }  // namespace gcm