Use extension-based file picker from CrOS for Aura builds.

chrome/browser/chromeos/preferences.cc

 // Copyright (c) 2011 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 "chrome/browser/chromeos/preferences.h"
 
 #include "base/command_line.h"
 #include "base/i18n/time_formatting.h"
 #include "base/metrics/histogram.h"
 #include "base/string_split.h"
@@ skipping 177 matching lines @@
   // Mobile plan notifications default to on.
   prefs->RegisterBooleanPref(prefs::kShowPlanNotifications,
                              true,
                              PrefService::SYNCABLE_PREF);
 
   // 3G first-time usage promo will be shown at least once.
   prefs->RegisterBooleanPref(prefs::kShow3gPromoNotification,
                              true,
                              PrefService::UNSYNCABLE_PREF);
 
-  // The map of timestamps of the last used file browser handlers.
-  prefs->RegisterDictionaryPref(prefs::kLastUsedFileBrowserHandlers,
-                                PrefService::UNSYNCABLE_PREF);
-
   // Use shared proxies default to off.
   prefs->RegisterBooleanPref(prefs::kUseSharedProxies,
                              false,
                              PrefService::SYNCABLE_PREF);
 
   // OAuth1 all access token and secret pair.
   prefs->RegisterStringPref(prefs::kOAuth1Token,
                             "",
                             PrefService::UNSYNCABLE_PREF);
   prefs->RegisterStringPref(prefs::kOAuth1Secret,
@@ skipping 390 matching lines @@
 
   // Remove invalid prefs.
   DictionaryPrefUpdate updater(prefs, prefs::kLanguagePreferredVirtualKeyboard);
   DictionaryValue* pref_value = updater.Get();
   for (size_t i = 0; i < layouts_to_remove.size(); ++i) {
     pref_value->RemoveWithoutPathExpansion(layouts_to_remove[i], NULL);
   }
 }
 
 }  // namespace chromeos