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

chrome/browser/sync/profile_sync_service_password_unittest.cc

Index: chrome/browser/sync/profile_sync_service_password_unittest.cc
diff --git a/chrome/browser/sync/profile_sync_service_password_unittest.cc b/chrome/browser/sync/profile_sync_service_password_unittest.cc
index c0e0803225b1262839444143c9e60e4c625d2999..eca4b95baeac4176d6a93ecb18ccb5fbbeb2cc1d 100644
--- a/chrome/browser/sync/profile_sync_service_password_unittest.cc
+++ b/chrome/browser/sync/profile_sync_service_password_unittest.cc
@@ -10,6 +10,7 @@
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/password_manager/password_store.h"
+#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/sync/abstract_profile_sync_service_test.h"
 #include "chrome/browser/sync/engine/syncapi.h"
 #include "chrome/browser/sync/glue/password_change_processor.h"
@@ -212,8 +213,7 @@ class ProfileSyncServicePasswordTest : public AbstractProfileSyncServiceTest {
   }
 
   void AddPasswordSyncNode(const PasswordForm& entry) {
-    sync_api::WriteTransaction trans(
-        service_->backend()->GetUserShareHandle());
+    sync_api::WriteTransaction trans(service_->GetUserShare());
     sync_api::ReadNode password_root(&trans);
     ASSERT_TRUE(password_root.InitByTagLookup(browser_sync::kPasswordTag));
 
@@ -226,7 +226,7 @@ class ProfileSyncServicePasswordTest : public AbstractProfileSyncServiceTest {
   }
 
   void GetPasswordEntriesFromSyncDB(std::vector<PasswordForm>* entries) {
-    sync_api::ReadTransaction trans(service_->backend()->GetUserShareHandle());
+    sync_api::ReadTransaction trans(service_->GetUserShare());
     sync_api::ReadNode password_root(&trans);
     ASSERT_TRUE(password_root.InitByTagLookup(browser_sync::kPasswordTag));