[Sync] Refactored ProfileSyncService and remove its backend() function

chrome/browser/sync/glue/preference_model_associator.cc

 // Copyright (c) 2010 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/sync/glue/preference_model_associator.h"
 
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/values.h"
 #include "base/utf_string_conversions.h"
@@ skipping 98 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   PrefService* pref_service = sync_service_->profile()->GetPrefs();
 
   int64 root_id;
   if (!GetSyncIdForTaggedNode(kPreferencesTag, &root_id)) {
     LOG(ERROR) << "Server did not create the top-level preferences node. We "
                << "might be running against an out-of-date server.";
     return false;
   }
 
-  sync_api::WriteTransaction trans(
-      sync_service()->backend()->GetUserShareHandle());
+  sync_api::WriteTransaction trans(sync_service_->GetUserShare());
   sync_api::ReadNode root(&trans);
   if (!root.InitByIdLookup(root_id)) {
     LOG(ERROR) << "Server did not create the top-level preferences node. We "
                << "might be running against an out-of-date server.";
     return false;
   }
 
   for (std::set<std::string>::iterator it = synced_preferences_.begin();
        it != synced_preferences_.end(); ++it) {
     const PrefService::Preference* pref =
@@ skipping 11 matching lines @@
 
 bool PreferenceModelAssociator::SyncModelHasUserCreatedNodes(bool* has_nodes) {
   DCHECK(has_nodes);
   *has_nodes = false;
   int64 preferences_sync_id;
   if (!GetSyncIdForTaggedNode(kPreferencesTag, &preferences_sync_id)) {
     LOG(ERROR) << "Server did not create the top-level preferences node. We "
                << "might be running against an out-of-date server.";
     return false;
   }
-  sync_api::ReadTransaction trans(
-      sync_service()->backend()->GetUserShareHandle());
+  sync_api::ReadTransaction trans(sync_service_->GetUserShare());
 
   sync_api::ReadNode preferences_node(&trans);
   if (!preferences_node.InitByIdLookup(preferences_sync_id)) {
     LOG(ERROR) << "Server did not create the top-level preferences node. We "
                << "might be running against an out-of-date server.";
     return false;
   }
 
   // The sync model has user created nodes if the preferences folder has any
   // children.
@@ skipping 33 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   SyncIdToPreferenceNameMap::iterator iter = id_map_inverse_.find(sync_id);
   if (iter == id_map_inverse_.end())
     return;
   id_map_.erase(iter->second);
   id_map_inverse_.erase(iter);
 }
 
 bool PreferenceModelAssociator::GetSyncIdForTaggedNode(const std::string& tag,
                                                        int64* sync_id) {
-  sync_api::ReadTransaction trans(
-      sync_service_->backend()->GetUserShareHandle());
+  sync_api::ReadTransaction trans(sync_service_->GetUserShare());
   sync_api::ReadNode sync_node(&trans);
   if (!sync_node.InitByTagLookup(tag.c_str()))
     return false;
   *sync_id = sync_node.GetId();
   return true;
 }
 
 Value* PreferenceModelAssociator::MergePreference(
     const PrefService::Preference& local_pref,
     const Value& server_value) {
@@ skipping 98 matching lines @@
   // notification to update the UI.
   if (0 == pref_name.compare(prefs::kShowBookmarkBar)) {
     NotificationService::current()->Notify(
         NotificationType::BOOKMARK_BAR_VISIBILITY_PREF_CHANGED,
         Source<PreferenceModelAssociator>(this),
         NotificationService::NoDetails());
   }
 }
 
 }  // namespace browser_sync