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

chrome/browser/sync/glue/theme_model_associator.cc

Index: chrome/browser/sync/glue/theme_model_associator.cc
diff --git a/chrome/browser/sync/glue/theme_model_associator.cc b/chrome/browser/sync/glue/theme_model_associator.cc
index 2dd02c22da655ee3481512e40b0d6d2b3bcd3a87..9789ece813e88af11184ffe4877d99c4676a317c 100644
--- a/chrome/browser/sync/glue/theme_model_associator.cc
+++ b/chrome/browser/sync/glue/theme_model_associator.cc
@@ -36,8 +36,7 @@ ThemeModelAssociator::ThemeModelAssociator(
 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;
@@ -83,8 +82,7 @@ bool ThemeModelAssociator::DisassociateModels() {
 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;