[Extensions] Remove unused parts of the preferencesPrivate API

chrome/browser/extensions/api/preferences_private/preferences_private_api.cc

-// Copyright 2014 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/extensions/api/preferences_private/preferences_private_api.h"
-
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/sync/profile_sync_service_factory.h"
-#include "chrome/common/extensions/api/preferences_private.h"
-#include "components/browser_sync/browser/profile_sync_service.h"
-#include "components/sync_driver/sync_prefs.h"
-
-namespace extensions {
-
-namespace GetSyncCategoriesWithoutPassphrase =
-    api::preferences_private::GetSyncCategoriesWithoutPassphrase;
-
-PreferencesPrivateGetSyncCategoriesWithoutPassphraseFunction::
-PreferencesPrivateGetSyncCategoriesWithoutPassphraseFunction() {}
-
-PreferencesPrivateGetSyncCategoriesWithoutPassphraseFunction::
-~PreferencesPrivateGetSyncCategoriesWithoutPassphraseFunction() {}
-
-void
-PreferencesPrivateGetSyncCategoriesWithoutPassphraseFunction::OnStateChanged() {
-  ProfileSyncService* sync_service =
-      ProfileSyncServiceFactory::GetForProfile(GetProfile());
-  if (sync_service->IsSyncActive()) {
-    sync_service->RemoveObserver(this);
-    RunAsync();
-    Release();  // Balanced in RunAsync().
-  }
-}
-
-bool PreferencesPrivateGetSyncCategoriesWithoutPassphraseFunction::RunAsync() {
-  ProfileSyncService* sync_service =
-      ProfileSyncServiceFactory::GetForProfile(GetProfile());
-  if (!sync_service)
-    return false;
-  if (!sync_service->IsSyncActive()) {
-    AddRef();  // Balanced in OnStateChanged().
-    sync_service->AddObserver(this);
-    return true;
-  }
-
-  syncer::ModelTypeSet result_set = syncer::UserSelectableTypes();
-
-  // Only include categories that are synced.
-  sync_driver::SyncPrefs sync_prefs(GetProfile()->GetPrefs());
-  if (!sync_prefs.HasKeepEverythingSynced()) {
-    result_set = syncer::Intersection(result_set,
-                                      sync_service->GetPreferredDataTypes());
-  }
-  // Don't include encrypted categories.
-  result_set = syncer::Difference(result_set,
-                                  sync_service->GetEncryptedDataTypes());
-
-  std::vector<std::string> categories;
-  for (syncer::ModelTypeSet::Iterator it = result_set.First(); it.Good();
-      it.Inc()) {
-    categories.push_back(syncer::ModelTypeToString(it.Get()));
-  }
-
-  results_ = GetSyncCategoriesWithoutPassphrase::Results::Create(categories);
-  SendResponse(true);
-  return true;
-}
-
-}  // namespace extensions