Avoid useless SYNC_CYCLE_CONTINUATION sync cycle

chrome/browser/sync/engine/get_commit_ids_command.h

 // Copyright (c) 2011 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 CHROME_BROWSER_SYNC_ENGINE_GET_COMMIT_IDS_COMMAND_H_
 #define CHROME_BROWSER_SYNC_ENGINE_GET_COMMIT_IDS_COMMAND_H_
 #pragma once
 
 #include <utility>
 #include <vector>
@@ skipping 10 matching lines @@
 namespace browser_sync {
 
 class GetCommitIdsCommand : public SyncerCommand {
   friend class SyncerTest;
 
  public:
   explicit GetCommitIdsCommand(int commit_batch_size);
   virtual ~GetCommitIdsCommand();
 
   // SyncerCommand implementation.
-  virtual void ExecuteImpl(sessions::SyncSession* session) OVERRIDE;
+  virtual SyncerError ExecuteImpl(sessions::SyncSession* session) OVERRIDE;
 
   // Builds a vector of IDs that should be committed.
   void BuildCommitIds(const vector<int64>& unsynced_handles,
                       syncable::WriteTransaction* write_transaction,
                       const ModelSafeRoutingInfo& routes,
                       syncable::ModelTypeSet throttled_types);
 
   // TODO(chron): Remove writes from this iterator. As a warning, this
   // iterator causes writes to entries and so isn't a pure iterator.
   // It will do Put(IS_UNSYNCED). Refactor this out later.
@@ skipping 116 matching lines @@
   int requested_commit_batch_size_;
   bool passphrase_missing_;
   syncable::ModelTypeSet encrypted_types_;
 
   DISALLOW_COPY_AND_ASSIGN(GetCommitIdsCommand);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_GET_COMMIT_IDS_COMMAND_H_