chromeos: Merge DriveDirectory::child_fils_ and child_directories_ into one variable, children_

chrome/browser/chromeos/drive/drive_files.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 CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILES_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILES_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 141 matching lines @@
   void RemoveChildren();
   void RemoveChildFiles();
   void RemoveChildDirectories();
 
   // Recursively extracts the paths set of all sub-directories.
   void GetChildDirectoryPaths(std::set<base::FilePath>* child_dirs);
 
   // Map between base_name and resource_id of files and directories.
   typedef std::map<base::FilePath::StringType, std::string> ChildMap;
   // Collection of children.
-  ChildMap child_files_;
-  ChildMap child_directories_;
+  ChildMap children_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveDirectory);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILES_H_