[Sync] Switch ModelTypeStore* from blocking pool to post_task.h

components/browser_sync/profile_sync_service.h

 // 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.
 
 #ifndef COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 541 matching lines @@
   // Returns a serialized NigoriKey proto generated from the bootstrap token in
   // SyncPrefs. Will return the empty string if no bootstrap token exists.
   std::string GetCustomPassphraseKey() const;
 
   // Set the provider for whether sync is currently allowed by the platform.
   void SetPlatformSyncAllowedProvider(
       const PlatformSyncAllowedProvider& platform_sync_allowed_provider);
 
   // Returns a function for |type| that will create a ModelTypeStore that shares
   // the sync LevelDB backend. |base_path| should be set to profile path.
-  // |sequenced_worker_pool| is obtained from content::BrowserThread or
-  // web::WebThread depending on platform.
   static syncer::ModelTypeStoreFactory GetModelTypeStoreFactory(
       syncer::ModelType type,
-      const base::FilePath& base_path,
-      base::SequencedWorkerPool* sequenced_worker_pool);
+      const base::FilePath& base_path);
 
   // Needed to test whether the directory is deleted properly.
   base::FilePath GetDirectoryPathForTest() const;
 
   // Sometimes we need to wait for tasks on the sync thread in tests.
   base::MessageLoop* GetSyncLoopForTest() const;
 
   // Some tests rely on injecting calls to the encryption observer.
   syncer::SyncEncryptionHandler::Observer* GetEncryptionObserverForTest() const;
 
@@ skipping 321 matching lines @@
   base::WeakPtrFactory<ProfileSyncService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(const syncer::SyncProtocolError& error);
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_