sync: Specialize functions that fetch type root

sync/syncable/model_neutral_mutable_entry.h

 // Copyright 2013 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.
 
 #ifndef SYNC_SYNCABLE_MODEL_NEUTRAL_MUTABLE_ENTRY_H_
 #define SYNC_SYNCABLE_MODEL_NEUTRAL_MUTABLE_ENTRY_H_
 
 #include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/syncable/entry.h"
@@ skipping 20 matching lines @@
                            CreateNewUpdateItem,
                            const Id& id);
   ModelNeutralMutableEntry(BaseWriteTransaction* trans, GetByHandle, int64);
   ModelNeutralMutableEntry(BaseWriteTransaction* trans, GetById, const Id&);
   ModelNeutralMutableEntry(
       BaseWriteTransaction* trans,
       GetByClientTag,
       const std::string& tag);
   ModelNeutralMutableEntry(
       BaseWriteTransaction* trans,
-      GetByServerTag,
-      const std::string& tag);
+      GetTypeRoot,
+      ModelType type);
 
   inline BaseWriteTransaction* base_write_transaction() const {
     return base_write_transaction_;
   }
 
   // Non-model-changing setters.  These setters will change properties internal
   // to the node.  These fields are important for bookkeeping in the sync
   // internals, but it is not necessary to communicate changes in these fields
   // to the local models.
   //
@@ skipping 54 matching lines @@
   // Scope: Set on construction, never changed after that.
   BaseWriteTransaction* const base_write_transaction_;
 
   DISALLOW_COPY_AND_ASSIGN(ModelNeutralMutableEntry);
 };
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_MODEL_NEUTRAL_MUTABLE_ENTRY_H_