sync: Specialize functions that fetch type root

sync/engine/directory_commit_contribution_unittest.cc

 // Copyright 2014 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 "sync/engine/directory_commit_contribution.h"
 
 #include "base/message_loop/message_loop.h"
 #include "sync/sessions/status_controller.h"
 #include "sync/syncable/entry.h"
 #include "sync/syncable/mutable_entry.h"
@@ skipping 18 matching lines @@
   }
 
   virtual void TearDown() OVERRIDE {
     dir_maker_.TearDown();
   }
 
  protected:
   int64 CreateUnsyncedItem(syncable::WriteTransaction* trans,
                            ModelType type,
                            const std::string& tag) {
-    syncable::Entry parent_entry(
-        trans,
-        syncable::GET_BY_SERVER_TAG,
-        ModelTypeToRootTag(type));
+    syncable::Entry parent_entry(trans, syncable::GET_TYPE_ROOT, type);
     syncable::MutableEntry entry(
         trans,
         syncable::CREATE,
         type,
         parent_entry.GetId(),
         tag);
     entry.PutIsUnsynced(true);
     return entry.GetMetahandle();
   }
 
   int64 CreateSyncedItem(syncable::WriteTransaction* trans,
                          ModelType type,
                          const std::string& tag) {
-    syncable::Entry parent_entry(
-        trans,
-        syncable::GET_BY_SERVER_TAG,
-        ModelTypeToRootTag(type));
+    syncable::Entry parent_entry(trans, syncable::GET_TYPE_ROOT, type);
     syncable::MutableEntry entry(
         trans,
         syncable::CREATE,
         type,
         parent_entry.GetId(),
         tag);
 
     entry.PutId(syncable::Id::CreateFromServerId(
         id_factory_.NewServerId().GetServerId()));
     entry.PutBaseVersion(10);
@@ skipping 268 matching lines @@
     EXPECT_TRUE(e1.GetId().ServerKnows());
     EXPECT_FALSE(e1.GetSyncing());
     EXPECT_LT(0, e1.GetServerVersion());
   }
 
   pref_cc->CleanUp();
   ext_cc->CleanUp();
 }
 
 }  // namespace syncer