Only re-enable remote service if the task used the network.

chrome/browser/sync_file_system/sync_task.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 CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNC_TASK_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNC_TASK_H_
 
 #include "chrome/browser/sync_file_system/sync_callbacks.h"
 
 namespace sync_file_system {
 
 class SyncTask {
  public:
-  SyncTask() {}
+  SyncTask() : used_network_(false) {}
   virtual ~SyncTask() {}
   virtual void Run(const SyncStatusCallback& callback) = 0;
 
+  bool used_network() { return used_network_; }
+
+ protected:
+  void set_used_network(bool used_network) {
+    used_network_ = used_network;
+  }
+
  private:
+  bool used_network_;
+
   DISALLOW_COPY_AND_ASSIGN(SyncTask);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNC_TASK_H_