Enable App List Sync by default

chrome/browser/sync/profile_sync_components_factory_impl.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 "base/command_line.h"
 #include "build/build_config.h"
 #include "chrome/browser/about_flags.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/bookmarks/enhanced_bookmarks_features.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 326 matching lines @@
 
   // App setting sync is enabled by default.  Register unless explicitly
   // disabled.
   if (!command_line_->HasSwitch(switches::kDisableSyncAppSettings)) {
     pss->RegisterDataTypeController(
         new ExtensionSettingDataTypeController(
             syncer::APP_SETTINGS, this, profile_, pss));
   }
 
 #if defined(ENABLE_APP_LIST)
   // App List sync is disabled by default.  Register only if enabled.

[tapted, 2014/03/05 22:33:38]

nit: update comment

[stevenjb, 2014/03/05 23:20:00]

Done.

-  if (command_line_->HasSwitch(switches::kEnableSyncAppList)) {
+  if (!command_line_->HasSwitch(switches::kDisableSyncAppList)) {
     pss->RegisterDataTypeController(
         new UIDataTypeController(
             BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
             base::Bind(&ChromeReportUnrecoverableError),
             syncer::APP_LIST,
             this,
             profile_,
             pss));
   }
 #endif
@@ skipping 250 matching lines @@
 ProfileSyncComponentsFactory::SyncComponents
     ProfileSyncComponentsFactoryImpl::CreateSessionSyncComponents(
        ProfileSyncService* profile_sync_service,
         DataTypeErrorHandler* error_handler) {
   SessionModelAssociator* model_associator =
       new SessionModelAssociator(profile_sync_service, error_handler);
   SessionChangeProcessor* change_processor =
       new SessionChangeProcessor(error_handler, model_associator);
   return SyncComponents(model_associator, change_processor);
 }