Split up extensions storage API implementations for sync and local storage.

chrome/browser/extensions/api/storage/settings_sync_util.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 CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_SYNC_UTIL_H_
 #define CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_SYNC_UTIL_H_
 
-
 #include "sync/api/sync_change.h"
 #include "sync/api/sync_data.h"
 
 namespace base {
 class Value;
-}  // namespace base
+}
+
+namespace content {
+class BrowserContext;
+}
+
+namespace syncer {
+class SyncableService;
+}
 
 namespace extensions {
 
 namespace settings_sync_util {
 
 // Creates a syncer::SyncData object for an extension or app setting.
 syncer::SyncData CreateData(
     const std::string& extension_id,
     const std::string& key,
     const base::Value& value,
@@ skipping 12 matching lines @@
     const std::string& key,
     const base::Value& value,
     syncer::ModelType type);
 
 // Creates a "delete" sync change for an extension or app setting.
 syncer::SyncChange CreateDelete(
     const std::string& extension_id,
     const std::string& key,
     syncer::ModelType type);
 
+// Returns the sync service for settings. Must be called on the FILE thread.
+// |type| must be either APP_SETTINGS or EXTENSION_SETTINGS.
+syncer::SyncableService* GetSyncableService(content::BrowserContext* context,
+                                            syncer::ModelType type);
+
 }  // namespace settings_sync_util
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_STORAGE_SETTINGS_SYNC_UTIL_H_