Revert of Sync starting language and input method preferences

chrome/browser/chromeos/input_method/input_method_syncer.h

-// 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_SYNCER_H_
-#define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_SYNCER_H_
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "base/prefs/pref_member.h"
-#include "chrome/browser/prefs/pref_service_syncable_observer.h"
-#include "ui/base/ime/chromeos/input_method_manager.h"
-
-class PrefServiceSyncable;
-
-namespace user_prefs {
-class PrefRegistrySyncable;
-}
-
-namespace chromeos {
-namespace input_method {
-
-// Helper class to handle syncing of language and input method preferences.
-// Changes to local preferences are handed up to the sync server. But Chrome OS
-// should not locally apply the corresponding preferences from the sync server,
-// except once: when the user first logs into the device.
-// Thus, the user's most recent changes to language and input method preferences
-// will be brought down when signing in to a new device but not in future syncs.
-class InputMethodSyncer : public PrefServiceSyncableObserver {
- public:
-  InputMethodSyncer(
-      PrefServiceSyncable* prefs,
-      scoped_refptr<input_method::InputMethodManager::State> ime_state);
-  virtual ~InputMethodSyncer();
-
-  // Registers the syncable input method prefs.
-  static void RegisterProfilePrefs(
-      user_prefs::PrefRegistrySyncable* registry);
-
-  // Must be called after InputMethodSyncer is created.
-  void Initialize();
-
- private:
-  // Adds the input methods from the syncable prefs to the device-local prefs.
-  // This should only be called once (after user's first sync) and only adds
-  // to, not removes from, the user's input method prefs.
-  void MergeSyncedPrefs();
-
-  // For the given input method pref, adds unique values from |synced_pref| to
-  // values in |pref|. The new values are converted from legacy engine IDs to
-  // input method IDs if necessary.
-  std::string AddSupportedInputMethodValues(
-      const std::string& pref,
-      const std::string& synced_pref,
-      const char* pref_name);
-
-  // Sets prefs::kLanguagePreferredLanguages and sets |merging_| to false.
-  void FinishMerge(scoped_ptr<std::string> languages);
-
-  // Callback method for preference changes. Updates the syncable prefs using
-  // the local pref values.
-  void OnPreferenceChanged(const std::string& pref_name);
-
-  // PrefServiceSyncableObserver implementation.
-  void OnIsSyncingChanged() override;
-
-  StringPrefMember preferred_languages_;
-  StringPrefMember preload_engines_;
-  StringPrefMember enabled_extension_imes_;
-  // These are syncable variants which don't change the device settings. We can
-  // set these to keep track of the user's most recent choices. That way, after
-  // the initial sync, we can add the user's synced choices to the values that
-  // have already been chosen at OOBE.
-  StringPrefMember preferred_languages_syncable_;
-  StringPrefMember preload_engines_syncable_;
-  StringPrefMember enabled_extension_imes_syncable_;
-
-  PrefServiceSyncable* prefs_;
-  scoped_refptr<input_method::InputMethodManager::State> ime_state_;
-
-  // Used to ignore PrefChanged events while InputMethodManager is merging.
-  bool merging_;
-
-  base::WeakPtrFactory<InputMethodSyncer> weak_factory_;
-};
-
-}  // namespace input_method
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_SYNCER_H_