[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

sync/engine/syncer_util.h

 // Copyright (c) 2012 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.
 //
 // Utility functions manipulating syncable::Entries, intended for use by the
 // syncer.
 
 #ifndef SYNC_ENGINE_SYNCER_UTIL_H_
 #define SYNC_ENGINE_SYNCER_UTIL_H_
 
@@ skipping 58 matching lines @@
                             syncable::Entry* target,
                             const bool deleted);
 
 // Assumes we have an existing entry; check here for updates that break
 // consistency rules.
 VerifyResult VerifyUpdateConsistency(syncable::WriteTransaction* trans,
                                      const sync_pb::SyncEntity& update,
                                      syncable::MutableEntry* target,
                                      const bool deleted,
                                      const bool is_directory,
-                                     syncer::ModelType model_type);
+                                     ModelType model_type);
 
 // Assumes we have an existing entry; verify an update that seems to be
 // expressing an 'undelete'
 VerifyResult VerifyUndelete(syncable::WriteTransaction* trans,
                             const sync_pb::SyncEntity& update,
                             syncable::MutableEntry* target);
 
 // Append |item|, followed by a chain of its predecessors selected by
 // |inclusion_filter|, to the |commit_ids| vector and tag them as included by
 // storing in the set |inserted_items|.  |inclusion_filter| (typically one of
@@ skipping 20 matching lines @@
     syncable::MetahandleSet* inserted_items,
     std::vector<syncable::Id>* commit_ids);
 
 void MarkDeletedChildrenSynced(
     syncable::Directory* dir,
     std::set<syncable::Id>* deleted_folders);
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_SYNCER_UTIL_H_