Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_browser.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 "chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_browser.h"
 
 #include <vector>
 
 #include "ash/launcher/launcher_model.h"
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
-#include "chrome/browser/prefs/pref_service.h"
+#include "chrome/browser/prefs/pref_service_syncable.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/app_icon_loader_impl.h"
 #include "chrome/browser/ui/ash/app_sync_ui_state.h"
 #include "chrome/browser/ui/ash/chrome_launcher_prefs.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item.h"
 #include "chrome/browser/ui/ash/launcher/launcher_app_tab_helper.h"
 #include "chrome/browser/ui/ash/launcher/launcher_context_menu.h"
 #include "chrome/browser/ui/ash/launcher/launcher_item_controller.h"
@@ skipping 237 matching lines @@
     i->second->OnRemoved();
     model_->RemoveItemAt(model_->ItemIndexByID(i->first));
   }
 
   if (ash::Shell::HasInstance())
     ash::Shell::GetInstance()->RemoveShellObserver(this);
 
   if (app_sync_ui_state_)
     app_sync_ui_state_->RemoveObserver(this);
 
-  profile_->GetPrefs()->RemoveObserver(this);
+  PrefServiceSyncable::FromProfile(profile_)->RemoveObserver(this);
 }
 
 void ChromeLauncherControllerPerBrowser::Init() {
   UpdateAppLaunchersFromPref();
 
   // TODO(sky): update unit test so that this test isn't necessary.
   if (ash::Shell::HasInstance()) {
     SetShelfAutoHideBehaviorFromPrefs();
     SetShelfAlignmentFromPrefs();
-    PrefServiceSyncable* prefs = profile_->GetPrefs();
+    PrefServiceSyncable* prefs = PrefServiceSyncable::FromProfile(profile_);
     if (!prefs->FindPreference(prefs::kShelfAlignmentLocal)->HasUserSetting() ||
         !prefs->FindPreference(prefs::kShelfAutoHideBehaviorLocal)->
             HasUserSetting()) {
       // This causes OnIsSyncingChanged to be called when the value of
       // PrefService::IsSyncing() changes.
       prefs->AddObserver(this);
     }
     ash::Shell::GetInstance()->AddShellObserver(this);
   }
 }
@@ skipping 639 matching lines @@
       profile_->GetPrefs(), root_window, prefs::kShelfAlignment, pref_value);
 
   if (root_window == ash::Shell::GetPrimaryRootWindow()) {
     // See comment in |kShelfAlignment| about why we have two prefs here.
     profile_->GetPrefs()->SetString(prefs::kShelfAlignmentLocal, pref_value);
     profile_->GetPrefs()->SetString(prefs::kShelfAlignment, pref_value);
   }
 }
 
 void ChromeLauncherControllerPerBrowser::OnIsSyncingChanged() {
-  MaybePropagatePrefToLocal(profile_->GetPrefs(),
+  PrefServiceSyncable* prefs = PrefServiceSyncable::FromProfile(profile_);
+  MaybePropagatePrefToLocal(prefs,
                             prefs::kShelfAlignmentLocal,
                             prefs::kShelfAlignment);
-  MaybePropagatePrefToLocal(profile_->GetPrefs(),
+  MaybePropagatePrefToLocal(prefs,
                             prefs::kShelfAutoHideBehaviorLocal,
                             prefs::kShelfAutoHideBehavior);
 }
 
 void ChromeLauncherControllerPerBrowser::OnAppSyncUIStatusChanged() {
   if (app_sync_ui_state_->status() == AppSyncUIState::STATUS_SYNCING)
     model_->SetStatus(ash::LauncherModel::STATUS_LOADING);
   else
     model_->SetStatus(ash::LauncherModel::STATUS_NORMAL);
 }
@@ skipping 301 matching lines @@
 void ChromeLauncherControllerPerBrowser::SetAppIconLoaderForTest(
     ash::AppIconLoader* loader) {
   app_icon_loader_.reset(loader);
 }
 
 const std::string&
 ChromeLauncherControllerPerBrowser::GetAppIdFromLauncherIdForTest(
     ash::LauncherID id) {
   return id_to_item_controller_map_[id]->app_id();
 }