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

sync/engine/get_commit_ids_command.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.
 
 #ifndef SYNC_ENGINE_GET_COMMIT_IDS_COMMAND_H_
 #define SYNC_ENGINE_GET_COMMIT_IDS_COMMAND_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 40 matching lines @@
   // are ready to commit.
   // An entry is not considered ready for commit if any are true:
   // 1. It's in conflict.
   // 2. It requires encryption (either the type is encrypted but a passphrase
   //    is missing from the cryptographer, or the entry itself wasn't properly
   //    encrypted).
   // 3. It's type is currently throttled.
   // 4. It's a delete but has not been committed.
   void FilterUnreadyEntries(
       syncable::BaseTransaction* trans,
-      syncer::ModelTypeSet throttled_types,
-      syncer::ModelTypeSet encrypted_types,
+      ModelTypeSet throttled_types,
+      ModelTypeSet encrypted_types,
       bool passphrase_missing,
       const syncable::Directory::UnsyncedMetaHandles& unsynced_handles,
       std::set<int64>* ready_unsynced_set);
 
  private:
   // Add all the uncommitted parents (and their predecessors) of |item| to
   // |result| if they are ready to commit. Entries are added in root->child
   // order and predecessor->successor order.
   // Returns values:
   //    False: if a dependent item was in conflict, and hence no child cannot be
@@ skipping 57 matching lines @@
 
   // Output parameter; see constructor comment.
   sessions::OrderedCommitSet* commit_set_;
 
   DISALLOW_COPY_AND_ASSIGN(GetCommitIdsCommand);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_GET_COMMIT_IDS_COMMAND_H_