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

chrome/browser/sync/glue/theme_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/theme_model_associator.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/sync/engine/syncapi.h"
@@ skipping 18 matching lines @@
 
 ThemeModelAssociator::ThemeModelAssociator(
     ProfileSyncService* sync_service)
     : sync_service_(sync_service) {
   DCHECK(sync_service_);
 }
 
 ThemeModelAssociator::~ThemeModelAssociator() {}
 
 bool ThemeModelAssociator::AssociateModels() {
-  sync_api::WriteTransaction trans(
-      sync_service_->backend()->GetUserShareHandle());
+  sync_api::WriteTransaction trans(sync_service_->GetUserShareHandle());
   sync_api::ReadNode root(&trans);
   if (!root.InitByTagLookup(kThemesTag)) {
     LOG(ERROR) << kNoThemesFolderError;
     return false;
   }
 
   Profile* profile = sync_service_->profile();
   sync_api::WriteNode node(&trans);
   // TODO(akalin): When we have timestamps, we may want to do
   // something more intelligent than preferring the sync data over our
@@ skipping 25 matching lines @@
 }
 
 bool ThemeModelAssociator::DisassociateModels() {
   // We don't maintain any association state, so nothing to do.
   return true;
 }
 
 bool ThemeModelAssociator::SyncModelHasUserCreatedNodes(bool* has_nodes) {
   DCHECK(has_nodes);
   *has_nodes = false;
-  sync_api::ReadTransaction trans(
-      sync_service_->backend()->GetUserShareHandle());
+  sync_api::ReadTransaction trans(sync_service_->GetUserShareHandle());
   sync_api::ReadNode root(&trans);
   if (!root.InitByTagLookup(kThemesTag)) {
     LOG(ERROR) << kNoThemesFolderError;
     return false;
   }
   // The sync model has user created nodes iff the themes folder has
   // any children.
   *has_nodes = root.GetFirstChildId() != sync_api::kInvalidId;
   return true;
 }
 
 }  // namespace browser_sync