Gender-neutralize a few more comments / strings.

components/user_prefs/tracked/pref_hash_store_impl.cc

 // Copyright 2013 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/user_prefs/tracked/pref_hash_store_impl.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 185 matching lines @@
     } else {
       // Keep the common part from the old |keyed_path| and replace the key to
       // get the new |keyed_path|.
       keyed_path.replace(common_part_length, std::string::npos, it.key());
       switch (outer_->pref_hash_calculator_.Validate(keyed_path, &it.value(),
                                                      entry->second)) {
         case PrefHashCalculator::VALID:
           break;
         case SECURE_LEGACY:
           // Secure legacy device IDs based hashes are still accepted, but we
-          // should make sure to notify the caller for him to update the legacy
+          // should make sure to notify the caller for them to update the legacy
           // hashes.
           has_secure_legacy_id_hashes = true;
           break;
         case PrefHashCalculator::INVALID:
           invalid_keys->push_back(it.key());
           break;
       }
       // Remove processed MACs, remaining MACs at the end will also be
       // considered invalid.
       split_macs.erase(entry);
@@ skipping 86 matching lines @@
 bool PrefHashStoreImpl::PrefHashStoreTransactionImpl::IsSuperMACValid() const {
   return super_mac_valid_;
 }
 
 bool PrefHashStoreImpl::PrefHashStoreTransactionImpl::StampSuperMac() {
   if (!outer_->use_super_mac_ || super_mac_valid_)
     return false;
   super_mac_dirty_ = true;
   return true;
 }