Gender-neutralize a few more comments / strings.

components/omnibox/browser/in_memory_url_index.cc

 // Copyright (c) 2012 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/omnibox/browser/in_memory_url_index.h"
 
 #include "base/files/file_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "components/history/core/browser/history_service.h"
@@ skipping 159 matching lines @@
     ClearPrivateData();
     needs_to_be_cached_ = true;
   } else {
     for (const auto& row : deleted_rows)
       needs_to_be_cached_ |= private_data_->DeleteURL(row.url());
   }
   // If we made changes, destroy the previous cache.  Otherwise, if we go
   // through an unclean shutdown (and therefore fail to write a new cache file),
   // when Chrome restarts and we restore from the previous cache, we'll end up
   // searching over URLs that may be deleted.  This would be wrong, and
-  // surprising to the user who bothered to delete some URLs from his/her
+  // surprising to the user who bothered to delete some URLs from their
   // history.  In this situation, deleting the cache is a better solution than
   // writing a new cache (after deleting the URLs from the in-memory structure)
   // because deleting the cache forces it to be rebuilt from history upon
   // startup.  If we instead write a new, updated cache then at the time of next
   // startup (after an unclean shutdown) we will not rebuild the in-memory data
   // structures from history but rather use the cache.  This solution is
   // mediocre because this cache may not have the most-recently-visited URLs
   // in it (URLs visited after user deleted some URLs from history), which
   // would be odd and confusing.  It's better to force a rebuild.
   base::FilePath path;
@@ skipping 139 matching lines @@
     task_runner_->PostTask(
         FROM_HERE,
         base::Bind(base::IgnoreResult(base::DeleteFile), path, false));
   }
 }
 
 void InMemoryURLIndex::OnCacheSaveDone(bool succeeded) {
   if (save_cache_observer_)
     save_cache_observer_->OnCacheSaveFinished(succeeded);
 }